Century Bancorp (CNBKA) 10-Q 6 Nov 20 2020 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Oct. 31, 2020
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Registrant Name	CENTURY BANCORP INC
Entity Central Index Key	0000812348
Entity Filer Category	Accelerated Filer
Entity Tax Identification Number	04-2498617
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Trading Symbol	CNBKA
Entity Address, State or Province	MA
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	0-15752
Entity Incorporation, State or Country Code	MA
Entity Address, City or Town	MEDFORD
Entity Address, Address Line One	400 MYSTIC AVENUE
Entity Address, Postal Zip Code	02155
City Area Code	781
Local Phone Number	391-4000
Title of 12(b) Security	Class A Common Stock
Security Exchange Name	NASDAQ
Class A Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		3,655,469
Class B Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		1,912,440

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 101,679	$ 44,420
Federal funds sold and interest-bearing deposits in other banks	310,901	214,273
Total cash and cash equivalents	412,580	258,693
Securities available-for-sale, amortized cost $291,440 and $260,924, respectively	291,632	260,502
Securities held-to-maturity, fair value $2,484,947 and $2,361,304, respectively	2,407,176	2,351,120
Federal Home Loan Bank of Boston, stock at cost	13,361	19,471
Equity securities, cost $1,635 and $1,635, respectively	1,645	1,688
Loans, net:
Total loans, net	2,990,133	2,426,119
Less: allowance for loan losses	33,394	29,585
Net loans	2,956,739	2,396,534
Bank premises and equipment	37,340	33,952
Accrued interest receivable	13,223	13,110
Goodwill	2,714	2,714
Other assets	159,016	154,640
Total assets	6,295,426	5,492,424
Deposits:
Demand deposits	991,590	712,842
Savings and NOW deposits	1,932,339	1,678,250
Money market accounts	1,906,676	1,453,572
Time deposits	581,866	555,447
Total deposits	5,412,471	4,400,111
Securities sold under agreements to repurchase	231,030	266,045
Other borrowed funds	152,248	370,955
Subordinated debentures	36,083	36,083
Due to broker	9,977
Other liabilities	90,183	86,649
Total liabilities	5,931,992	5,159,843
Stockholders' Equity
Preferred Stock – $1.00 par value; 100,000 shares authorized; no shares issued and outstanding
Additional paid-in capital	12,292	12,292
Retained earnings	367,836	338,980
Stockholders' equity before adjustment of accumulated other comprehensive income (loss)	385,696	356,840
Unrealized gains(losses) on securities available-for-sale, net of taxes	137	(308)
Unrealized losses on securities transferred to held-to-maturity, net of taxes	(1,341)	(1,812)
Pension liability, net of taxes	(21,058)	(22,139)
Total accumulated other comprehensive loss, net of taxes	(22,262)	(24,259)
Total stockholders' equity	363,434	332,581
Total liabilities and stockholders' equity	6,295,426	5,492,424
Construction and land development [Member]
Loans, net:
Total loans, net	9,116	8,992
Commercial and industrial [Member]
Loans, net:
Total loans, net	1,315,407	812,417
Municipal [Member]
Loans, net:
Total loans, net	130,047	120,455
Commercial real estate [Member]
Loans, net:
Total loans, net	784,895	786,102
Residential real estate [Member]
Loans, net:
Total loans, net	443,703	371,897
Consumer and overdrafts [Member]
Loans, net:
Total loans, net	19,866	21,893
Home equity [Member]
Loans, net:
Total loans, net	287,099	304,363
Class A Common Stock [Member]
Stockholders' Equity
Common stock value	3,656	3,651
Total stockholders' equity	3,656	3,651
Class B Common Stock [Member]
Stockholders' Equity
Common stock value	1,912	1,917
Total stockholders' equity	$ 1,912	$ 1,917

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Amortized cost	$ 291,440	$ 260,924
Held-to-maturity securities, fair value	2,484,947	2,361,304
Equity securities, amortized cost	$ 1,635	$ 1,635
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	100,000	100,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A Common Stock [Member]
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	3,655,469	3,650,949
Class B Common Stock [Member]
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	5,000,000	5,000,000
Common stock, shares issued	1,912,440	1,916,960

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest income
Loans	$ 21,431	$ 22,117	$ 63,478	$ 65,106
Securities held-to-maturity	14,186	14,623	44,701	43,006
Securities available-for-sale	818	2,184	3,493	7,305
Federal funds sold and interest-bearing deposits in other banks	69	928	747	3,204
Total interest income	36,504	39,852	112,419	118,621
Interest expense
Savings and NOW deposits	1,726	5,445	7,569	16,788
Money market accounts	3,056	5,050	12,090	15,805
Time deposits	2,858	3,038	9,141	8,724
Securities sold under agreements to repurchase	241	697	1,176	1,572
Other borrowed funds and subordinated debentures	1,292	1,852	4,093	5,274
Total interest expense	9,173	16,082	34,069	48,163
Net interest income	27,331	23,770	78,350	70,458
Provision for loan losses	900	75	3,675	700
Net interest income after provision for loan losses	26,431	23,695	74,675	69,758
Other operating income
Service charges on deposit accounts	2,239	2,310	6,558	6,801
Lockbox fees	996	937	2,850	3,018
Net gains on sales of securities		53	13	61
Gains on sales of mortgage loans				154
Other income	934	986	3,112	3,676
Total other operating income	4,169	4,286	12,520	13,710
Operating expenses
Salaries and employee benefits	11,362	10,670	33,020	32,621
Occupancy	1,477	1,463	4,448	4,686
Equipment	809	862	2,608	2,440
FDIC assessments	410		720	723
Other	4,109	4,467	12,586	13,447
Total operating expenses	18,167	17,462	53,382	53,917
Income before income taxes	12,433	10,519	33,813	29,551
Provision for income taxes	1,546	435	3,204	584
Net income	$ 10,887	$ 10,084	$ 30,609	$ 28,967
Class A Common Stock [Member]
Share data:
Weighted average number of shares outstanding, basic	3,655,469	3,650,449	3,653,429	3,627,076
Weighted average number of shares outstanding, diluted	5,567,909	5,567,909	5,567,909	5,567,909
Basic earnings per share	$ 2.36	$ 2.19	$ 6.64	$ 6.30
Diluted earnings per share	$ 1.96	$ 1.81	$ 5.50	$ 5.20
Class B Common Stock [Member]
Share data:
Weighted average number of shares outstanding, basic	1,912,440	1,917,460	1,914,480	1,940,833
Weighted average number of shares outstanding, diluted	1,912,440	1,917,460	1,914,480	1,940,833
Basic earnings per share	$ 1.18	$ 1.09	$ 3.32	$ 3.15
Diluted earnings per share	$ 1.18	$ 1.09	$ 3.32	$ 3.15

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 10,887	$ 10,084	$ 30,609	$ 28,967
Unrealized gains (losses) on securities:
Unrealized gains (losses) arising during period	486	113	445	(112)
Less: reclassification adjustment for gains included in net income		(39)		(44)
Total unrealized gains (losses) on securities	486	74	445	(156)
Accretion of net unrealized losses transferred	145	155	471	574
Defined benefit pension plans:
Amortization of prior service cost and loss included in net periodic benefit cost	360	263	1,081	790
Other comprehensive income	991	492	1,997	1,208
Comprehensive income	$ 11,878	$ 10,576	$ 32,606	$ 30,175

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Class A Common Stock [Member]	Class B Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member]Class A Common Stock [Member]	Retained Earnings [Member]Class B Common Stock [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning balance at Dec. 31, 2018	$ 300,439	$ 3,608	$ 1,960	$ 12,292	$ 301,488			$ (18,909)
Net income	28,967				28,967
Other comprehensive income, net of tax:
Unrealized holding (losses) gains arising during period, net of taxes	(156)							(156)
Accretion of unrealized losses on securities transferred to held-to-maturity, net of taxes	574							574
Pension liability adjustment, net of taxes	790							790
Conversion of Class B Common Stock to Class A Common Stock		42	(42)
Cash dividends		(1,304)	(350)			$ (1,304)	$ (350)
Ending balance at Sep. 30, 2019	328,960	3,650	1,918	12,292	328,801			(17,701)
Beginning balance at Jun. 30, 2019	318,937	3,620	1,948	12,292	319,270			(18,193)
Net income	10,084				10,084
Other comprehensive income, net of tax:
Unrealized holding (losses) gains arising during period, net of taxes	74							74
Accretion of unrealized losses on securities transferred to held-to-maturity, net of taxes	155							155
Pension liability adjustment, net of taxes	263							263
Conversion of Class B Common Stock to Class A Common Stock		30	(30)
Cash dividends		(438)	(115)			(438)	(115)
Ending balance at Sep. 30, 2019	328,960	3,650	1,918	12,292	328,801			(17,701)
Beginning balance at Dec. 31, 2019	332,581	3,651	1,917	12,292	338,980			(24,259)
Net income	30,609				30,609
Other comprehensive income, net of tax:
Unrealized holding (losses) gains arising during period, net of taxes	445							445
Accretion of unrealized losses on securities transferred to held-to-maturity, net of taxes	471							471
Pension liability adjustment, net of taxes	1,081							1,081
Conversion of Class B Common Stock to Class A Common Stock		5	(5)
Cash dividends		(1,389)	(364)			(1,389)	(364)
Ending balance at Sep. 30, 2020	363,434	3,656	1,912	12,292	367,836			(22,262)
Beginning balance at Jun. 30, 2020	352,202	3,653	1,915	12,292	357,595			(23,253)
Net income	10,887				10,887
Other comprehensive income, net of tax:
Unrealized holding (losses) gains arising during period, net of taxes	486							486
Accretion of unrealized losses on securities transferred to held-to-maturity, net of taxes	145							145
Pension liability adjustment, net of taxes	360							360
Conversion of Class B Common Stock to Class A Common Stock		3	(3)
Cash dividends		(512)	(134)			$ (512)	$ (134)
Ending balance at Sep. 30, 2020	$ 363,434	$ 3,656	$ 1,912	$ 12,292	$ 367,836			$ (22,262)

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Unrealized holding (losses) gains arising during period, taxes	$ 181	$ 23	$ 169	$ 52
Realized net gains		53		61
Accretion of net unrealized losses transferred during the period, taxes	51	54	166	205
Pension liability adjustment, taxes	$ 142	$ 103	$ 422	$ 309
Class A Common Stock [Member]
Conversion of Class B Common Stock to Class A Common Stock, shares	3,000	30,000	4,520	42,120
Cash dividends, per share	$ 0.14	$ 0.12	$ 0.38	$ 0.36
Class B Common Stock [Member]
Conversion of Class B Common Stock to Class A Common Stock, shares	3,000	30,000	4,520	42,120
Cash dividends, per share	$ 0.07	$ 0.06	$ 0.19	$ 0.18

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 30,609	$ 28,967
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sales of mortgage loans		(154)
Net gains on sales of securities	(13)	(61)
Net loss (gain) on equity securities	43	(76)
Provision for loan losses	3,675	700
Deferred income taxes	(1,487)	(593)
Net depreciation and amortization	(1,167)	(1,693)
(Increase) decrease in accrued interest receivable	(113)	1,131
Decrease (increase) in other assets	3,897	(1,037)
Increase in other liabilities	3,396	2,029
Net cash provided by operating activities	38,853	29,213
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from redemptions of Federal Home Loan Bank of Boston stock	10,836	13,801
Purchase of Federal Home Loan Bank of Boston stock	(4,726)	(9,852)
Proceeds from calls/maturities of securities available-for-sale	57,493	115,574
Proceeds from sales of securities available-for-sale	16,285	16,285
Purchase of securities available-for-sale	(87,751)	(57,005)
Proceeds from calls/maturities of securities held-to-maturity	596,043	313,358
Purchase of securities held-to-maturity	(638,023)	(427,124)
Proceeds from sales of securities held-to-maturity		1,194
(Purchases) proceeds from life insurance policies	(6,000)	5,124
Net increase in loans	(563,850)	(98,915)
Proceeds from sales of portfolio loans		8,871
Capital expenditures	(5,873)	(9,962)
Net cash used in investing activities	(641,851)	(128,651)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in time deposits	26,419	(27,505)
Net increase (decrease) in demand, savings, money market and NOW deposits	985,941	(39,606)
Cash dividends	(1,753)	(1,654)
Net (decrease) increase in securities sold under agreements to repurchase	(35,015)	152,995
Net (decrease) increase in other borrowed funds	(218,707)	6,810
Net cash provided by financing activities	756,885	91,040
Net increase (decrease) in cash and cash equivalents	153,887	(8,398)
Cash and cash equivalents at beginning of period	258,693	342,503
Cash and cash equivalents at end of period	412,580	334,105
Cash paid (received) during the period for:
Interest	34,384	48,127
Income tax refunds	1,750
Income taxes		(6,604)
Change in unrealized gains (losses) on securities available-for-sale, net of taxes	445	(156)
Change in unrealized gains (losses) on securities transferred to held-to-maturity, net of taxes	471	574
Pension liability adjustment, net of taxes	1,081	$ 790
Change in due to broker	$ 9,977

Basis of Financial Statement Pr

Basis of Financial Statement Presentation	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Financial Statement Presentation	Note 1. Basis of Financial Statement Presentation The consolidated financial statements include the accounts of Century Bancorp, Inc. (the “Company”) and its wholly owned subsidiary, Century Bank and Trust Company (the “Bank”). The consolidated financial statements also include the accounts of the Bank’s wholly owned subsidiaries, Century Subsidiary Investments, Inc. (“CSII”), Century Subsidiary Investments, Inc. II (“CSII II”), Century Subsidiary Investments, Inc. III (“CSII III”) and Century Financial Services Inc. (“CFSI”). CSII, CSII II, and CSII III are engaged in buying, selling and holding investment securities. CFSI has the power to engage in financial agency, securities brokerage, and investment and financial advisory services and related securities credit. The Company also owns 100% of Century Bancorp Capital Trust II (“CBCT II”). The entity is an unconsolidated subsidiary of the Company. All significant intercompany accounts and transactions have been eliminated in consolidation. The Company provides a full range of banking services to individual, business and municipal customers in Massachusetts, New Hampshire, Rhode Island, Connecticut, and New York. As a bank holding company, the Company is subject to the regulation and supervision of the Federal Reserve Board. The Bank, a state chartered financial institution, is subject to supervision and regulation by applicable state and federal banking agencies, including the Federal Reserve Board, the Federal Deposit Insurance Corporation (the “FDIC”) and the Commonwealth of Massachusetts Commissioner of Banks. The Bank is also subject to various requirements and restrictions under federal and state law, including requirements to maintain reserves against deposits, restrictions on the types and amounts of loans that may be granted and the interest that may be charged thereon, and limitations on the types of investments that may be made and the types of services that may be offered. Various consumer laws and regulations also affect the operations of the Bank. In addition to the impact of regulation, commercial banks are affected significantly by the actions of the Federal Reserve Board as it attempts to control the money supply and credit availability in order to influence the economy. All aspects of the Company’s business are highly competitive. The Company faces aggressive competition from other lending institutions and from numerous other providers of financial services. The Company has one reportable operating segment. The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America and general practices within the banking industry. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ from those estimates. The Company’s quarterly report on Form 10-Q 10-K On March 27, 2020, the Coronavirus Aid, Relief and Economic Security (CARES) Act was signed into law. The CARES Act allows certain companies to delay FASB ASU 2016-13, 2016-13. Material estimates that are susceptible to change in the near term relate to the allowance for loan losses. Management believes that the allowance for loan losses is adequate based on a review of factors, including historical charge-off COVID-19

Securities Available-for-Sale

Securities Available-for-Sale	9 Months Ended
	Sep. 30, 2020
Text Block [Abstract]
Securities Available-for-Sale	Note 2. Securities Available-for-Sale September 30, 2020 December 31, 2019 Amortized Gross Gross Fair Amortized Gross Gross Fair (in thousands) SBA Backed Securities $ 46,147 $ — $ 282 $ 45,865 $ 54,331 $ 23 $ 143 $ 54,211 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 189,531 767 394 189,904 184,580 139 532 184,187 Privately Issued Residential 347 1 7 341 397 1 2 396 Obligations Issued by States 48,815 — — 48,815 18,016 60 — 18,076 Other Debt Securities 6,600 113 6 6,707 3,600 51 19 3,632 Total $ 291,440 $ 881 $ 689 $ 291,632 $ 260,924 $ 274 $ 696 $ 260,502 Included in SBA Backed Securities, and U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities are securities at fair value pledged to secure public deposits and repurchase agreements amounting to $196,225,000 and $186,245,000 at September 30, 2020 and December 31, 2019, respectively. Also included in securities available-for-sale available-for-sale available-for-sale available-for-sale Debt securities of U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities primarily refer to debt securities of Fannie Mae and Freddie Mac. The following table shows the maturity distribution of the Company’s securities available-for-sale Amortized Fair (in thousands) Within one year $ 52,775 $ 52,763 After one but within five years 124,574 125,000 After five but within ten years 97,505 97,430 More than 10 years 16,586 16,439 Total $ 291,440 $ 291,632 The weighted average remaining life of investment securities available-for-sale As of September 30, 2020 and December 31, 2019, management concluded that the unrealized losses of its investment securities are temporary in nature since they are not related to the underlying credit quality of the issuers, and the Company does not intend to sell these debt securities and it is not more likely than not that it will be required to sell these debt securities before the anticipated recovery of its remaining amortized cost. In making its other-than-temporary impairment evaluation, the Company considered that the principal and interest on these securities are from issuers that are investment grade. The unrealized loss on SBA Backed Securities, U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities related primarily to interest rates and not credit quality, and because the Company has the ability and intent to hold these investments until recovery of fair value, which may be maturity, the Company does not consider these investments to be other-than-temporarily impaired at September 30, 2020 or December 31, 2019. In evaluating the underlying credit quality of a security, management considers several factors such as the credit rating of the obligor and the issuer, if applicable. Internal reviews of issuer financial statements are performed as deemed necessary. In the case of privately issued mortgage-backed securities, the performance of the underlying loans is analyzed as deemed necessary to determine the estimated future cash flows of the securities. Factors considered include the level of subordination, current and estimated future default rates, current and estimated prepayment rates, estimated loss severity rates, geographic concentrations and origination dates of underlying loans. The following table shows the temporarily impaired securities of the Company’s available-for-sale September 30, 2020 Less than 12 months 12 months or longer Total Temporarily Impaired Investments Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) SBA Backed Securities $ 16,625 $ 50 $ 29,240 $ 232 $ 45,865 $ 282 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 29,870 156 33,686 238 63,556 394 Privately Issued Residential Mortgage-Backed Securities 219 7 — — 219 7 Obligations Issued by States and Political Subdivisions — — — — — — Other Debt Securities — — 1,294 6 1,294 6 Total temporarily impaired securities $ 46,714 $ 213 $ 64,220 $ 476 $ 110,934 $ 689 The following table shows the temporarily impaired securities of the Company’s available-for-sale December 31, 2019 Less than 12 months 12 months or longer Total Temporarily Impaired Investments Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) SBA Backed Securities $ 14,560 $ 30 $ 22,092 $ 113 $ 36,652 $ 143 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 108,806 379 29,178 153 137,984 532 Privately Issued Residential Mortgage-Backed Securities 252 2 — — 252 2 Obligations Issued by States and Political Subdivisions — — — — — — Other Debt Securities 800 1 481 18 1,281 19 Total temporarily impaired securities $ 124,418 $ 412 $ 51,751 $ 284 $ 176,169 $ 696

Investment Securities Held-to-M

Investment Securities Held-to-Maturity	9 Months Ended
	Sep. 30, 2020
Text Block [Abstract]
Investment Securities Held-to-Maturity	Note 3. Investment Securities Held-to-Maturity September 30, 2020 December 31, 2019 Amortized Gross Gross Estimated Amortized Gross Gross Estimated Fair (in thousands) U.S. Government Sponsored Enterprises $ 248,211 $ 594 $ 494 $ 248,311 $ 98,867 $ 527 $ 96 $ 99,298 SBA Backed Securities 39,384 2,375 — 41,759 44,379 182 303 44,258 U.S. Government Sponsored Enterprises Mortgage- Backed Securities 2,119,581 76,185 889 2,194,877 2,207,874 20,720 10,846 2,217,748 Total $ 2,407,176 $ 79,154 $ 1,383 $ 2,484,947 $ 2,351,120 $ 21,429 $ 11,245 $ 2,361,304 Included in total investment securities held-to-maturity held-to-maturity held-to-maturity held-to-maturity held-to-maturity At September 30, 2020 and December 31, 2019, all mortgage-backed securities are obligations of U.S. Government Sponsored Enterprises. Debt securities of U.S. Government Sponsored Enterprises and U.S. Government Sponsored Enterprises Mortgage-Backed Securities primarily refer to debt securities of Fannie Mae and Freddie Mac. The following table shows the maturity distribution of the Company’s securities held-to-maturity Amortized Fair (in thousands) Within one year $ 64,436 $ 64,929 After one but within five years 1,954,304 2,018,674 After five but within ten years 385,428 397,910 More than ten years 3,008 3,434 Total $ 2,407,176 $ 2,484,947 The weighted average remaining life of investment securities held-to-maturity As of September 30, 2020 and December 31, 2019, management concluded that the unrealized losses of its investment securities are temporary in nature since they are not related to the underlying credit quality of the issuers, and the Company does not intend to sell these debt securities and it is not more likely than not that it will be required to sell these debt securities before the anticipated recovery of their remaining amortized costs. In making its other-than-temporary impairment evaluation, the Company considered the fact that the principal and interest on these securities are from issuers that are investment grade. The unrealized loss on U.S. Government Sponsored Enterprises, SBA Backed Securities, and U.S. Government Sponsored Enterprises Mortgage-Backed Securities related primarily to interest rates and not credit quality, and because the Company does not intend to sell any of these securities and it is not more likely than not that it will be required to sell these securities before the anticipated recovery of the remaining amortized cost, the Company does not consider these investments to be other-than-temporarily impaired at September 30, 2020 or December 31, 2019. In evaluating the underlying credit quality of a security, management considers several factors such as the credit rating of the obligor and the issuer, if applicable. Internal reviews of issuer financial statements are performed as deemed necessary. The following table shows the temporarily impaired securities of the Company’s held-to-maturity September 30, 2020 Less Than 12 Months 12 Months or Longer Total Temporarily Impaired Investments Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) SBA Backed Securities $ — $ — $ — $ — $ — $ — US Government Sponsored Enterprises Mortgage-Backed Securities 128,240 494 — — 128,240 494 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 129,158 840 4,176 49 133,334 889 Total temporarily impaired securities $ 257,398 $ 1,334 $ 4,176 $ 49 $ 261,574 $ 1,383 The following table shows the temporarily impaired securities of the Company’s held-to-maturity December 31, 2019 Less Than 12 Months 12 Months or Longer Total Temporarily Impaired Investments Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) U.S. Treasury $ — $ — $ — $ — $ — $ — U.S. Government Sponsored Enterprises 24,420 72 9,976 24 34,396 96 SBA Backed Securities 25,251 303 — — 25,251 303 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 613,905 3,949 389,919 6,897 1,003,824 10,846 Total temporarily impaired securities $ 663,576 $ 4,324 $ 399,895 $ 6,921 $ 1,063,471 $ 11,245

Allowance for Loan Losses

Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Allowance for Loan Losses	Note 4. Allowance for Loan Losses The Company maintains an allowance for loan losses in an amount determined by management on the basis of the character of the loans, loan performance, financial condition of borrowers, the value of collateral securing loans and other relevant factors. The following table summarizes the changes in the Company’s allowance for loan losses for the periods indicated. Three months ended Nine months ended 2020 2019 2020 2019 (in thousands) Allowance for loan losses, beginning of period $ 32,516 $ 29,070 $ 29,585 $ 28,543 Loans charged off (41 ) (118 ) (120 ) (336 ) Recoveries on loans previously charged-off 19 70 254 190 Net recoveries (charge-offs) (22 ) (48 ) 134 (146 ) Provision charged to expense 900 75 3,675 700 Allowance for loan losses, end of period $ 33,394 $ 29,097 $ 33,394 $ 29,097 Further information pertaining to the allowance for loan losses for the three months ending September 30, 2020 is as follows: Construction Commercial Municipal Commercial Residential Consumer Home Unallocated Total Allowance for loan losses: (in thousands) Balance at June 30, 2020 $ 289 $ 13,121 $ 2,868 $ 11,303 $ 3,094 $ 289 $ 1,465 $ 87 $ 32,516 Charge-offs — (20 ) — — — (21 ) — — (41 ) Recoveries — 12 — — — 7 — — 19 Provision 76 2,731 (300 ) (522 ) (958 ) 35 (200 ) 38 900 Ending balance at September 30, 2020 $ 365 $ 15,844 $ 2,568 $ 10,781 $ 2,136 $ 310 $ 1,265 $ 125 $ 33,394 Amount of allowance for loan losses for loans deemed to be impaired $ — $ 12 $ — $ 75 $ — $ — $ — $ — $ 87 Amount of allowance for loan losses for loans not deemed to be impaired $ 365 $ 15,832 $ 2,568 $ 10,706 $ 2,136 $ 310 $ 1,265 $ 125 $ 33,307 Loans: Ending balance $ 9,116 $ 1,315,407 $ 130,047 $ 784,895 $ 443,703 $ 19,866 $ 287,099 $ — $ 2,990,133 Loans deemed to be impaired $ — $ 160 $ — $ 2,675 $ 236 $ — $ — $ — $ 3,071 Loans not deemed to be impaired $ 9,116 $ 1,315,247 $ 130,047 $ 782,220 $ 443,467 $ 19,866 $ 287,099 $ — $ 2,987,062 Further information pertaining to the allowance for loan losses for the nine months ending September 30, 2020 is as follows: Construction Commercial Municipal Commercial Residential Consumer Home Unallocated Total Allowance for loan losses: (in thousands) Balance at December 31, 2019 $ 331 $ 11,596 $ 2,566 $ 11,464 $ 2,194 $ 312 $ 1,065 $ 57 $ 29,585 Charge-offs — (31 ) — — — (89 ) — — (120 ) Recoveries — 182 — — — 67 5 — 254 Provision 34 4,097 2 (683 ) (58 ) 20 195 68 3,675 Ending balance at September 30, 2020 $ 365 $ 15,844 $ 2,568 $ 10,781 $ 2,136 $ 310 $ 1,265 $ 125 $ 33,394 Amount of allowance for loan losses for loans deemed to be impaired $ — $ 12 $ — $ 75 $ — $ — $ — $ — $ 87 Amount of allowance for loan losses for loans not deemed to be impaired $ 365 $ 15,832 $ 2,568 $ 10,706 $ 2,136 $ 310 $ 1,265 $ 125 $ 33,307 Loans: Ending balance $ 9,116 $ 1,315,407 $ 130,047 $ 784,895 $ 443,703 $ 19,866 $ 287,099 $ — $ 2,990,133 Loans deemed to be impaired $ — $ 160 $ — $ 2,675 $ 236 $ — $ — $ — $ 3,071 Loans not deemed to be impaired $ 9,116 $ 1,315,247 $ 130,047 $ 782,220 $ 443,467 $ 19,866 $ 287,099 $ — $ 2,987,062 The allocations for the provision for loan losses increased for the three and nine months ended September 30, 2020, primarily as a result of the economic uncertainties associated with the novel coronavirus disease (COVID–19) pandemic and increased loan balances. During the nine months ending September 30, 2020, the Company’s provision was primarily attributable to an increase in commercial and industrial, offset, somewhat, by a decrease in commercial real estate. During the three months ending September 30, 2020, the Company’s provision was primarily attributable to an increase in commercial and industrial, offset, somewhat, by a decrease in commercial real estate, residential real estate, and municipal balances. As of September 30, 2020, the Company’s U.S. Small Business Administration (SBA) Payroll Protection Program (PPP) loans totaled approximately 1,324 loans for approximately $232 million. These types of loans are categorized as commercial and industrial and are 100% guaranteed by the SBA and require no allowance for loan losses. Further information pertaining to the allowance for loan losses for the three months ending September 30, 2019 is as follows: Construction Commercial Municipal Commercial Residential Consumer Home Unallocated Total Allowance for loan losses: (in thousands) Balance at June 30, 2019 $ 1,052 $ 11,338 $ 1,832 $ 10,848 $ 2,210 $ 380 $ 1,120 $ 290 $ 29,070 Charge-offs — (57 ) — — — (61 ) — — (118 ) Recoveries — 23 — — — 47 — — 70 Provision (752 ) 9 751 53 (24 ) (84 ) (33 ) 155 75 Ending balance at September 30, 2019 $ 300 $ 11,313 $ 2,583 $ 10,901 $ 2,186 $ 282 $ 1,087 $ 445 $ 29,097 Amount of allowance for loan losses for loans deemed to be impaired $ — $ 2 $ — $ 86 $ — $ — $ — $ — $ 88 Amount of allowance for loan losses for loans not deemed to be impaired $ 300 $ 11,311 $ 2,583 $ 10,815 $ 2,186 $ 282 $ 1,087 $ 445 $ 29,009 Loans: Ending balance $ 7,824 $ 783,950 $ 121,802 $ 765,385 $ 364,317 $ 21,748 $ 310,635 $ — $ 2,375,661 Loans deemed to be impaired $ — $ 203 $ — $ 2,373 $ — $ — $ — $ — $ 2,576 Loans not deemed to be impaired $ 7,824 $ 783,747 $ 121,802 $ 763,012 $ 364,317 $ 21,748 $ 310,635 $ — $ 2,373,085 Further information pertaining to the allowance for loan losses for the nine months ending September 30, 2019 is as follows: Construction Commercial Municipal Commercial Residential Consumer Home Unallocated Total Allowance for loan losses: (in thousands) Balance at December 31, 2018 $ 1,092 $ 10,998 $ 1,838 $ 10,663 $ 2,190 $ 365 $ 1,111 $ 286 $ 28,543 Charge-offs — (108 ) — — — (228 ) — — (336 ) Recoveries — 49 — — — 141 — — 190 Provision (792 ) 374 745 238 (4 ) 4 (24 ) 159 700 Ending balance at September 30, 2019 $ 300 $ 11,313 $ 2,583 $ 10,901 $ 2,186 $ 282 $ 1,087 $ 445 $ 29,097 Amount of allowance for loan losses for loans deemed to be impaired $ — $ 2 $ — $ 86 $ — $ — $ — $ — $ 88 Amount of allowance for loan losses for loans not deemed to be impaired $ 300 $ 11,311 $ 2,583 $ 10,815 $ 2,186 $ 282 $ 1,087 $ 445 $ 29,009 Loans: Ending balance $ 7,824 $ 783,950 $ 121,802 $ 765,385 $ 364,317 $ 21,748 $ 310,635 $ — $ 2,375,661 Loans deemed to be impaired $ — $ 203 $ — $ 2,373 $ — $ — $ — $ — $ 2,576 Loans not deemed to be impaired $ 7,824 $ 783,747 $ 121,802 $ 763,012 $ 364,317 $ 21,748 $ 310,635 $ — $ 2,373,085 During the nine months ending September 30, 2019, the Company’s provision was primarily attributable to an increase in municipal, commercial and industrial, and commercial real estate balances offset, somewhat, by a decrease in construction and land development balances. During the three months ending September 30, 2019, the Company’s provision was primarily attributable to an increase in municipal balances offset, somewhat, by a decrease in construction and land development balances. The Company monitors the outlook for the industries in which our borrowers operate. Healthcare and higher education are two of the primary industries. In particular the Company utilizes outlooks and forecasts from various sources. The Company also monitors the volatility of the losses within the historical data. Overall, there were improvements in historical loss rates. The Company utilizes a six grade internal loan rating system for commercial real estate, construction, commercial, and municipal loans as follows: Loans rated 1-3 Loans in this category are considered “pass” rated loans with low to average risk. Loans rated 4 (Monitor): These loans represent classified loans that management is closely monitoring for credit quality. These loans have had or may have minor credit quality deterioration as of September 30, 2020 and December 31, 2019. Loans rated 5 (Substandard): Substandard loans represent classified loans that management is closely monitoring for credit quality. These loans have had more significant credit quality deterioration as of September 30, 2020 and December 31, 2019. Loans rated 6 (Doubtful): Doubtful loans represent classified loans that management is closely monitoring for credit quality. These loans had more significant credit quality deterioration as of September 30, 2020 and December 31, 2019 and full collectability is doubtful. Impaired: Impaired loans represent classified loans that management is closely monitoring for credit quality. A loan is classified as impaired when it is probable that the Company will be unable to collect all amounts due. The following table presents the Company’s loans by risk rating at September 30, 2020. Construction Commercial Municipal Commercial Grade: (in thousands) 1-3 $ 9,116 $ 1,308,693 $ 130,047 $ 757,953 4 (Monitor) — 6,554 — 24,267 5 (Substandard) — — — — 6 (Doubtful) — — — — Impaired — 160 — 2,675 Total $ 9,116 $ 1,315,407 $ 130,047 $ 784,895 The following table presents the Company’s loans by risk rating at December 31, 2019. Construction Commercial Municipal Commercial Grade: (in thousands) 1-3 $ 8,992 $ 807,486 $ 120,455 $ 759,402 4 (Monitor) — 4,025 — 24,354 5 (Substandard) — — — — 6 (Doubtful) — — — — Impaired — 906 — 2,346 Total $ 8,992 $ 812,417 $ 120,455 $ 786,102 Credit ratings issued by national organizations were utilized as credit quality indicators as presented in the following table at September 30, 2020 and are included within the total loan portfolio. Commercial Municipal Commercial Total Credit Rating: (in thousands) Aaa – Aa3 $ 647,056 $ 64,806 $ 38,365 $ 750,227 A1 – A3 184,409 7,228 145,467 337,104 Baa1 – Baa3 50,000 51,133 140,486 241,619 Ba2 — 5,080 — 5,080 Total $ 881,465 $ 128,247 $ 324,318 $ 1,334,030 Credit ratings issued by national organizations were utilized as credit quality indicators as presented in the following table at December 31, 2019. Commercial Municipal Commercial Total Credit Rating: (in thousands) Aaa – Aa3 $ 523,644 $ 53,273 $ 40,437 $ 617,354 A1 – A3 186,044 7,354 148,346 341,744 Baa1 – Baa3 — 51,133 144,711 195,844 Ba2 — 5,895 — 5,895 Total $ 709,688 $ 117,655 $ 333,494 $ 1,160,837 The Company utilized payment performance as credit quality indicators for the loan types listed below. The indicators are depicted in the table “aging of past due loans,” below. Further information pertaining to the allowance for loan losses at September 30, 2020 follows: Accruing 30-89 Days Non Accruing Total Current Total (in thousands) Construction and land development $ — $ — $ — $ — $ 9,116 $ 9,116 Commercial and industrial 623 3 — 626 1,314,781 1,315,407 Municipal — — — — 130,047 130,047 Commercial real estate 3,596 593 49 4,238 780,657 784,895 Residential real estate 569 532 — 1,101 442,602 443,703 Consumer and overdrafts 15 — — 15 19,851 19,866 Home equity 1,206 291 — 1,497 285,602 287,099 Total $ 6,009 $ 1,419 $ 49 $ 7,477 $ 2,982,656 $ 2,990,133 Further information pertaining to the allowance for loan losses at December 31, 2019 follows: Accruing 30-89 Days Non Accruing Total Current Total (in thousands) Construction and land development $ — $ — $ — $ — $ 8,992 $ 8,992 Commercial and industrial 227 400 — 627 811,790 812,417 Municipal — — — — 120,455 120,455 Commercial real estate 840 492 — 1,332 784,770 786,102 Residential real estate 1,563 683 — 2,246 369,651 371,897 Consumer and overdrafts 18 4 — 22 21,871 21,893 Home equity 603 435 — 1,038 303,325 304,363 Total $ 3,251 $ 2,014 $ — $ 5,265 $ 2,420,854 $ 2,426,119 Impaired loans A loan is impaired when, based on current information and events, it is probable that a creditor will be unable to collect all amounts due according to the contractual terms of the loan agreement. When a loan is impaired, the Company measures impairment based on the present value of expected future cash flows discounted at the loan’s effective interest rate, except that as a practical expedient, the Company measures impairment based on a loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. Loans are charged-off charged-off The following is information pertaining to impaired loans for September 30, 2020: Carrying Unpaid Required Average Interest Average Interest With no required reserve recorded: (in thousands) Construction and land development $ — $ — $ — $ — $ — $ — $ — Commercial and industrial 67 88 — 73 — 288 2 Municipal — — — — — — — Commercial real estate 592 624 — 601 — 365 — Residential real estate 236 236 — 236 — 118 — Consumer — — — — — — — Home equity — — — — — — — Total $ 895 $ 948 $ — $ 910 $ — $ 771 $ 2 With required reserve recorded: Construction and land development $ — $ — $ — $ — $ — $ — $ — Commercial and industrial 93 93 12 100 1 95 3 Municipal — — — — — — — Commercial real estate 2,083 2,209 75 2,094 21 2,140 65 Residential real estate — — — — — — — Consumer — — — — — — — Home equity — — — — — — — Total $ 2,176 $ 2,302 $ 87 $ 2,194 $ 22 $ 2,235 $ 68 Total: Construction and land development $ — $ — $ — $ — $ — $ — $ — Commercial and industrial 160 181 12 173 1 383 5 Municipal — — — — — — — Commercial real estate 2,675 2,833 75 2,695 21 2,505 65 Residential real estate 236 236 — 236 — 118 — Consumer — — — — — — — Home equity — — — — — — — Total $ 3,071 $ 3,250 $ 87 $ 3,104 $ 22 $ 3,006 $ 70 The following is information pertaining to impaired loans for September 30, 2019: Carrying Unpaid Required Average Interest Average Interest With no required reserve recorded: (in thousands) Construction and land development $ — $ — $ — $ — $ — $ — $ — Commercial and industrial 87 306 — 89 2 87 6 Municipal — — — — — — — Commercial real estate 167 194 — 729 — 529 — Residential real estate — — — — — — — Consumer — — — — — — — Home equity — — — — — — — Total $ 254 $ 500 $ — $ 818 $ 2 $ 616 $ 6 With required reserve recorded: Construction and land development $ — $ — $ — $ — $ — $ — $ — Commercial and industrial 116 116 2 310 2 299 6 Municipal — — — — — — — Commercial real estate 2,206 2,326 86 2,140 23 2,350 67 Residential real estate — — — — — — — Consumer — — — — — — — Home equity — — — — — — — Total $ 2,322 $ 2,442 $ 88 $ 2,450 $ 25 $ 2,649 $ 73 Total: Construction and land development $ — $ — $ — $ — $ — $ — $ — Commercial and industrial 203 422 2 399 4 386 12 Municipal — — — — — — — Commercial real estate 2,373 2,520 86 2,869 23 2,879 67 Residential real estate — — — — — — — Consumer — — — — — — — Home equity — — — — — — — Total $ 2,576 $ 2,942 $ 88 $ 3,268 $ 27 $ 3,265 $ 79 Troubled debt restructurings (“TDR”) are identified as modifications in which a concession was granted to a customer who was having financial difficulties. This concession may be below market rate, longer amortization/term, or a lower payment amount. The present value calculation of the modifications did not result in an increase in the allowance for these loans beyond any previously established allocations. There was no TDR that occurred during the nine-month period ended September 30, 2020. Also, there were no commitments to lend additional funds to troubled debt restructuring borrowers. There were no troubled debt restructurings that subsequently defaulted during the first nine months of 2020. Under Section 4013 of the CARES Act, loans less than 30 days past due as of December 31, 2019 will be considered current for COVID-19 COVID-19 COVID-19 As of September 30, 2020, and as a result of COVID-19 There was no troubled debt restructuring that occurred during the nine-month period ended September 30, 2019. Also, there were no commitments to lend additional funds to troubled debt restructuring borrowers. There were no troubled debt restructurings that subsequently defaulted during the first nine months of 2019.

Reclassifications Out of Accumu

Reclassifications Out of Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2020
Text Block [Abstract]
Reclassifications Out of Accumulated Other Comprehensive Income	Note 5. Reclassifications Out of Accumulated Other Comprehensive Income (a) Amount Reclassified from Accumulated Other Comprehensive Income Details about Accumulated Other Three Three Affected Line Item in the Statement where Net (in thousands) Unrealized gains and losses on available-for-sale $ — $ 54 Net gains on sales of investments — (15 ) Provision for income taxes $ — $ 39 Net income Accretion of unrealized losses transferred $ (196 ) $ (209 ) Interest on securities held-to-maturity 51 54 Provision for income taxes $ (145 ) $ (155 ) Net income Amortization of defined benefit Prior-service costs $ (29 ) (b) $ (29 ) (b) Salaries and employee benefits Actuarial gains (losses) (472 ) (b) (337 ) (b) Salaries and employee benefits Total before tax (501 ) (366 ) Income before taxes Tax (expense) or benefit 141 103 Provision for income taxes Net of tax $ (360 ) $ (263 ) Net income Details about Accumulated Other Nine Nine Affected Line Item in the Statement where Net (in thousands) Unrealized gains and losses on available-for-sale $ — $ 61 Net gains on sales of investments — (17 ) Provision for income taxes $ — $ 44 Net income Accretion of unrealized losses transferred $ (637 ) $ (779 ) Interest on securities held-to-maturity 166 205 Provision for income taxes $ (471 ) $ (574 ) Net income Amortization of defined benefit Prior-service costs $ (86 ) (b) $ (86 ) (b) Salaries and employee benefits Actuarial gains (losses) (1,417 ) (b) (1,013 ) (b) Salaries and employee benefits Total before tax (1,503 ) (1,099 ) Income before taxes Tax (expense) or benefit 422 309 Provision for income taxes Net of tax $ (1,081 ) $ (790 ) Net income (a) Amount in parentheses indicates reductions to net income. (b) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Employee Benefits footnote (Note 7) for additional details).

Earnings per share ("EPS")

Earnings per share ("EPS")	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Earnings per share ("EPS")	Note 6. Earnings per Share (“EPS”) Class A and Class B shares participate equally in undistributed earnings. Under the Company’s Articles of Organization, the holders of Class A Common Stock are entitled to receive dividends per share equal to at least 200% of dividends paid, if any, from time to time, on each share of Class B Common Stock. Diluted EPS includes the dilutive effect of common stock equivalents and assumes the conversion of all Class B common stock; basic EPS excludes all common stock equivalents. The Company had no common stock equivalents outstanding for the periods ended September 30, 2020 and 2019. The following table is a reconciliation of basic EPS and diluted EPS. Three Months Ended Nine Months Ended (in thousands except share and per share data) 2020 2019 2020 2019 Basic EPS Computation: Numerator: Net income, Class A $ 8,630 $ 7,986 $ 24,254 $ 22,853 Net income, Class B 2,257 2,098 6,355 6,114 Denominator: Weighted average shares outstanding, Class A 3,655,469 3,650,449 3,653,429 3,627,076 Weighted average shares outstanding, Class B 1,912,440 1,917,460 1,914,480 1,940,833 Basic EPS, Class A $ 2.36 $ 2.19 $ 6.64 $ 6.30 Basic EPS, Class B 1.18 1.09 3.32 3.15 Diluted EPS Computation: Numerator: Net income, Class A $ 8,630 $ 7,986 $ 24,254 $ 22,853 Net income, Class B 2,257 2,098 6,355 6,114 Total net income, for diluted EPS, Class A computation 10,887 10,084 30,609 28,967 Denominator: Weighted average shares outstanding, basic, Class A 3,655,469 3,650,449 3,653,429 3,627,076 Weighted average shares outstanding, Class B 1,912,440 1,917,460 1,914,480 1,940,833 Weighted average shares outstanding diluted, Class A 5,567,909 5,567,909 5,567,909 5,567,909 Weighted average shares outstanding, Class B 1,912,440 1,917,460 1,914,480 1,940,833 Diluted EPS, Class A $ 1.96 $ 1.81 $ 5.50 $ 5.20 Diluted EPS, Class B 1.18 1.09 3.32 3.15

Employee Benefits

Employee Benefits	9 Months Ended
	Sep. 30, 2020
Retirement Benefits [Abstract]
Employee Benefits	Note 7. Employee Benefits The Company provides pension benefits to its employees under a noncontributory, defined benefit plan which is funded on a current basis in compliance with the requirements of the Employee Retirement Income Security Act of 1974 (“ERISA”) and recognizes costs over the estimated employee service period. The Company also has a Supplemental Executive Insurance/Retirement Plan (the “Supplemental Plan”) which is limited to certain officers and employees of the Company. The Supplemental Plan is accrued on a current basis and recognizes costs over the estimated employee service period. Executive officers of the Company and its subsidiaries who have at least one year of service may participate in the Supplemental Plan. The Supplemental Plan is voluntary, and participants are required to contribute to its cost. Life insurance policies, which are owned by the Company, are purchased covering the lives of each participant. Components of Net Periodic Benefit Cost for the Three Months Ended September 30, Pension Benefits Supplemental Insurance/ 2020 2019 2020 2019 (in thousands) Service cost $ 344 $ 276 $ 353 $ 256 Interest 450 473 466 482 Expected return on plan assets (952 ) (819 ) — — Recognized prior service cost (benefit) — — 29 28 Recognized net actuarial losses 261 229 211 109 Net periodic benefit (credit) cost $ 103 $ 159 $ 1,059 $ 875 Components of Net Periodic Benefit Cost for the Nine Months Ended September 30, Pension Benefits Supplemental Insurance/ 2020 2019 2020 2019 (in thousands) Service cost $ 1,032 $ 828 $ 1,059 $ 768 Interest 1,350 1,419 1,398 1,445 Expected return on plan assets (2,856 ) (2,457 ) — — Recognized prior service cost (benefit) — — 87 86 Recognized net actuarial losses 783 687 633 326 Net periodic benefit (credit) cost $ 309 $ 477 $ 3,177 $ 2,625 Approximately $1,395,000 and $1,506,000 of costs other than service costs, from the table above, are included in other expenses with the remaining cost included in salaries and employee benefits, for the nine months ended September 30, 2020 and 2019, respectively. Contributions The Company does not intend to contribute to the Defined Benefit Pension Plan in 2020.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 8. Fair Value Measurements The Company follows FASB ASC 820-10, 2016-1, (Subtopic 825-10) Recognition and Measurement of Financial Assets and Financial Liabilities 820-10 Level I – Quoted prices are available in active markets for identical assets or liabilities as of the reported date. The type of financial instruments included in Level I are highly liquid cash instruments with quoted prices such as G-7 Level II – Pricing inputs are other than quoted prices in active markets, which are either directly or indirectly observable as of the reported date. The nature of these financial instruments include cash instruments for which quoted prices are available but traded less frequently, derivative instruments whose fair value have been derived using a model where inputs to the model are directly observable in the market, or can be derived principally from or corroborated by observable market data, and instruments that are fair valued using other financial instruments, the parameters of which can be directly observed. Instruments which are generally included in this category are corporate bonds and loans, mortgage whole loans, municipal bonds, and OTC derivatives. Level III – Instruments that have little to no pricing observability as of the reported date. These financial instruments do not have two-way The results of the fair value hierarchy as of September 30, 2020, are as follows: Fair Value Measurements Using Carrying Quoted Prices Significant Significant (in thousands) Financial Instruments Measured at Fair Value on a Recurring Basis Securities AFS SBA Backed Securities $ 45,865 $ — $ 45,865 $ — U.S. Government Agency and Sponsored 189,904 — 189,904 — Privately Issued Residential Mortgage- 341 — 341 — Obligations Issued by States and 48,815 — — 48,815 Other Debt Securities 6,707 — 6,707 — Total $ 291,632 $ — $ 242,817 $ 48,815 Equity Securities $ 1,645 $ 276 $ 1,369 $ — Financial Instruments Measured at Fair Value Non-recurring Impaired Loans $ 828 $ — $ — $ 828 Impaired loan balances represent those collateral dependent loans where management has estimated the credit loss by comparing the loan’s carrying value against the expected realizable fair value of the collateral. Fair value is generally determined through a review process that includes independent appraisals, discounted cash flows, or other external assessments of the underlying collateral, which generally include various Level 3 inputs which are not observable. The Company discounts the fair values, as appropriate, based on management’s observations of the local real estate market for loans in this category. Appraisals, discounted cash flows and real estate tax assessments are reviewed quarterly. There is no specific policy regarding how frequently appraisals will be updated. Adjustments are made to appraisals and real estate tax assessments based on management’s estimate of changes in real estate values. All impaired loans have been reviewed during the past quarter using either a discounted cash flow analysis, appraisal of collateral or other type of real estate tax assessment. The types of adjustments that are made to specific provisions (credits) related to impaired loans recognized for the three and nine month periods ended September 30, 2020 amounted to $0 and ($9,000), respectively. There were no transfers between level 1, 2 and 3 for the nine months ended September 30, 2020. There were no liabilities measured at fair value on a recurring or nonrecurring basis during the nine months ended September 30, 2020. The following table presents additional information about assets measured at fair value on a recurring and nonrecurring basis for which the Company has utilized Level 3 inputs to determine fair value (dollars in thousands). Management continues to monitor the assumptions used to value the assets listed below. Asset Fair Value Valuation Technique Unobservable Input Unobservable Input Securities AFS $ 48,815 Discounted cash flow Discount rate 0%-1% (3) Impaired Loans $ 828 Appraisal Appraisal 0% (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated expenses. (3) Weighted averages. The changes in Level 3 securities for the nine month period ended September 30, 2020 are shown in the table below: Obligations Balance at December 31, 2019 $ 13,301 Purchases 53,903 Maturities and calls (18,357 ) Amortization (32 ) Balance at September 30, 2020 $ 48,815 The amortized cost of Level 3 securities was $48,815,000 at September 30, 2020 with an unrealized loss of $0. The securities in this category are generally municipal securities with no readily determinable fair value. Management evaluated the fair value of these securities based on an evaluation of the underlying issuer, prevailing rates and market liquidity. The fair value of impaired loans decreased by $49,000, for the first nine months of 2020, mainly attributable to one loan that was paid down. The changes in Level 3 securities for the nine month period ended September 30, 2019, are shown in the table below: Obligations Balance at December 31, 2018 $ 88,728 Purchases 13,290 Maturities and calls (78,196 ) Amortization (21 ) Changes in fair value — Balance at September 30, 2019 $ 23,801 The amortized cost of Level 3 securities was $23,801,000 at September 30, 2019 with an unrealized loss of $0. The securities in this category are generally municipal securities with no readily determinable fair value. Management evaluated the fair value of these securities based on an evaluation of the underlying issuer, prevailing rates and market liquidity. The fair value of impaired loans decreased by $78,000, for the first nine months of 2019, mainly attributable to one loan that was removed from impaired loans. There were no liabilities measured at fair value on a recurring or nonrecurring basis during the nine month period ended September 30, 2019. The results of the fair value hierarchy as of December 31, 2019, are as follows: Securities AFS Fair Value Measurements Using Carrying Quoted Prices Significant Significant (in thousands) Financial Instruments Measured at Fair Value on a Recurring Basis: SBA Backed Securities $ 54,211 $ — $ 54,211 $ — U.S. Government Agency and Sponsored 184,187 — 184,187 — Privately Issued Residential Mortgage- 396 — 396 — Obligations Issued by States and 18,076 — 4,775 13,301 Other Debt Securities 3,632 3,632 — Total $ 260,502 $ — $ 247,201 $ 13,301 Financial Instruments Measured at Fair Value on a Recurring Basis Equity Securities $ 1,688 $ 343 $ 1,345 $ — Financial Instruments Measured at Fair Value on a Non-recurring $ 877 $ — $ — $ 877 Impaired loan balances in the table above represent those collateral dependent loans where management has estimated the credit loss by comparing the loan’s carrying value against the expected realizable fair value of the collateral. Fair value is generally determined through a review process that includes independent appraisals, discounted cash flows, or other external assessments of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. The Company discounts the fair values, as appropriate, based on management’s observations of the local real estate market for loans in this category. Appraisals, discounted cash flows and real estate tax assessments are reviewed quarterly. There is no specific policy regarding how frequently appraisals will be updated. Adjustments are made to appraisals and real estate tax assessments based on management’s estimate of changes in real estate values. Within the past twelve months there have been no updated appraisals, however, all impaired loans have been reviewed during the past quarter using either a discounted cash flow analysis or other type of real estate tax assessment. The types of adjustments that are made to specific provisions relate to impaired loans recognized for 2019 for the estimated credit loss amounted to $79,000. There were no transfers between level 1, 2 and 3 for the year ended December 31, 2019. There were no liabilities measured at fair value on a recurring or nonrecurring basis during the year ended December 31, 2019. The following table presents additional information about assets measured at fair value on a recurring and nonrecurring basis for which the Company has utilized Level 3 inputs to determine fair value (dollars in thousands). Management continues to monitor the assumptions used to value the assets listed below. Asset Fair Value Valuation Technique Unobservable Input Unobservable Input Securities AFS $ 13,301 Discounted cash flow Discount rate 1.5%-3.2% (3) Impaired Loans $ 877 Appraisal Appraisal 0%-30% discount (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated expenses. (3) Weighted averages.

Fair Values of Financial Instru

Fair Values of Financial Instruments	9 Months Ended
	Sep. 30, 2020
Investments, All Other Investments [Abstract]
Fair Values of Financial Instruments	Note 9. Fair Values of Financial Instruments The following methods and assumptions were used by the Company in estimating fair values of its financial instruments. Excluded from this disclosure are all non-financial The assumptions used below are expected to approximate those that market participants would use in valuing these financial instruments. Fair value estimates are made at a specific point in time, based on available market information and judgments about the financial instrument, including estimates of timing, amount of expected future cash flows and the credit standing of the issuer. Such estimates do not consider the tax impact of the realization of unrealized gains or losses. In some cases, the fair value estimates cannot be substantiated by comparison to independent markets. In addition, the disclosed fair value may not be realized in the immediate settlement of the financial instrument. Care should be exercised in deriving conclusions about our business, its value or financial position based on the fair value information of financial instruments presented below. Securities Held-to-Maturity The fair values of these securities were based on quoted market prices, where available, as provided by third-party investment portfolio pricing vendors. If quoted market prices were not available, fair values provided by the vendors were based on quoted market prices of comparable instruments in active markets and/or based on a matrix pricing methodology which employs The Bond Market Association’s standard calculations for cash flow and price/yield analysis, live benchmark bond pricing and terms/condition data available from major pricing sources. Management regards the inputs and methods used by third party pricing vendors to be “Level 2 inputs and methods” as defined in the “fair value hierarchy” provided by FASB. Loans The fair value of loans is estimated using the exit price notion consistent with Topic 820, Fair Value Measurement. Fair value is determined based on a discounted cash flow analysis. The discounted cash flow analysis was based on the contractual maturity of the loan and market indications of rates, prepayment speeds, defaults and credit risk. For certain non-performing Time Deposits The fair value of time deposits was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments. The fair values of the Company’s time deposit liabilities do not take into consideration the value of the Company’s long-term relationships with depositors, which may have significant value. Other Borrowed Funds The fair value of other borrowed funds is based on the discounted value of contractual cash flows. The discount rate used is estimated based on the rates currently offered for other borrowed funds of similar remaining maturities. Subordinated Debentures The fair value of subordinated debentures is based on the discounted value of contractual cash flows. The discount rate used is estimated based on the rates currently offered for other subordinated debentures of similar remaining maturities. The following presents (in thousands) the carrying amount, estimated fair value, and placement in the fair value hierarchy of the Company’s financial instruments as of September 30, 2020 and December 31, 2019. This table excludes financial instruments for which the carrying amount approximates fair value. Financial assets for which the fair value approximates carrying value include cash and cash equivalents, short-term investments, FHLBB stock and accrued interest receivable. Financial liabilities for which the fair value approximates carrying value include non-maturity September 30, 2020 Carrying Amount Estimated Fair Value Measurements Level 2 Inputs Level 3 Inputs (in thousands) Financial assets: Securities held-to-maturity $ 2,407,176 $ 2,484,947 $ — $ 2,484,947 $ — Loans (1) 2,956,739 2,885,187 — — 2,885,187 Financial liabilities: Time deposits 581,866 596,675 — 596,675 — Other borrowed funds 152,248 159,690 — 159,690 — Subordinated debentures 36,083 36,083 — 36,083 — December 31, 2019 Financial assets: Securities held-to-maturity $ 2,351,120 $ 2,361,304 $ — $ 2,361,304 $ — Loans (1) 2,396,534 2,424,770 — — 2,424,770 Financial liabilities: Time deposits 555,447 560,746 — 560,746 — Other borrowed funds 370,955 374,531 — 374,531 — Subordinated debentures 36,083 36,083 — 36,083 — (1) Comprised of loans (including collateral dependent impaired loans), net of deferred loan costs and the allowance for loan losses. Limitations Fair value estimates are made at a specific point in time, based on relevant market information and information about the type of financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Bank’s entire holdings of a particular financial instrument. Because no active market exists for some of the Bank’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, cash flows, current economic conditions, risk characteristics and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions and changes in the loan, debt and interest rate markets could significantly affect the estimates. Further, the income tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on the fair value estimates and have not been considered.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Note 10. Revenue from Contracts with Customers Revenue from contracts with customers in the scope of ASC Topic 606 is measured based on the consideration specified in the contract with a customer, and excludes amounts collected on behalf of third parties. The Company recognizes revenue from contracts with customers when it satisfies its performance obligations. The Company’s performance obligations are typically satisfied as services are rendered, and our contracts do not include multiple performance obligations. Payment is generally collected at the time services are rendered, or monthly. Unsatisfied performance obligations at the report date are not material to our consolidated financial statements. The Company pays sales commissions to its employees in accordance with certain incentive plans. The Company expenses sales commissions when incurred if we do not expect to recover these costs from the terms of the contract with the customer. Sales commissions are included in compensation expense. In certain cases, other parties are involved with providing products and services to our customers. If the Company is a principal in the transaction (providing goods or services itself), revenues are reported based on the gross consideration received from the customer and any related expenses are reported gross in noninterest expense. If the Company is an agent in the transaction (arranging for another party to provide goods or services), the Company reports its net fee or commission retained as revenue. Waivers and reversals are recorded as a reduction of revenue either when the revenue is recognized by the Company or at the time the waiver or reversal is earned by the customer. A. Nature of goods and services The vast majority of the Company’s revenue is specifically out-of-scope in-scope, a. Revenue earned at a point in time – Examples of revenue earned at a point in time are ATM transaction fees, wire transfer fees, NSF fees, credit and debit card interchange fees and foreign exchange transaction fees. Revenue is generally derived from transactional information accumulated by our systems and is recognized as revenue immediately as the transactions occur or upon providing the service to complete the customer’s transaction. The Company is the principal in each of these contracts, with the exception of credit and debit card interchange fees, in which case we are acting as the agent and record revenue net of expenses paid to the principal. b. Revenue earned over time – The Company earns revenue from contracts with customers in a variety of ways in which the revenue is earned over a period of time – generally monthly or quarterly. Examples of this type of revenue are deposit account service fees, lockbox fees, investment management fees, merchant referral services, and safe deposit box fees. Account service charges, management fees and referral fees are recognized on a monthly basis while any transaction based income is recorded as the activity occurs. Revenue is primarily based on the number and type of transactions or assets managed and is generally derived from transactional information accumulated by our systems. Revenue is recorded in the same period as the related transactions occur or services are rendered to the customer. B. Disaggregation of revenue The following table presents total revenues as presented in the Consolidated Statements of Income and the related amounts which are from contracts with customers within the scope of Topic 606. As illustrated here, the vast majority of our revenues are specifically excluded from the scope of Topic 606. Nine 9/30/2020 Revenue from Nine Revenue from (dollars in thousands) Total net interest income $ 78,350 $ — $ 70,458 $ — Noninterest income: Service charges on deposit accounts 6,558 6,558 6,801 6,801 Lockbox fees 2,850 2,850 3,018 3,018 Net gains on sales of securities — — 61 — Gains on sales of mortgage loans — — 154 — Other income 3,112 1,738 3,676 2,338 Total noninterest income 12,520 11,146 13,710 12,157 Total revenues $ 90,870 $ 11,146 $ 84,168 $ 12,157 Three 9/30/2020 Revenue from Three Revenue from (dollars in thousands) Total interest income $ 27,331 $ — $ 23,770 $ — Noninterest income: Service charges on deposit accounts 2,239 2,239 2,310 2,310 Lockbox fees 996 996 937 937 Net gains on sales of securities — — 53 — Gains on sales of mortgage loans — — — — Other income 934 580 986 728 Total noninterest income 4,169 3,815 4,286 3,975 Total revenues $ 31,500 $ 3,815 $ 28,056 $ 3,975 The following table provides information about receivables with customers. September 30, 2020 December 31, 2019 (dollars in thousands) Receivables, which are included in “Other assets” $ 1,362 $ 1,200

Leases

Leases	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Leases	Note 11. Leases The Company has operating leases primarily for branch locations as well as data processing centers. The Company’s operating leases have remaining lease terms of 1 year to 32 years, some of which include options to extend the leases for up to 10 years, and some of which include options to terminate the leases within 1 year. The Company also has one sublease for part of a data processing center that the Company currently leases from a lessor. The sublease expires in 2022 with an option to terminate and no option to extend. Lease income, for the sublease, totaled approximately $30,000 for the nine months ended September 30, 2020. Variable lease costs include costs that are not included in the lease liability. The components of lease expense were as follows: Three 9/30/2020 Nine 9/30/2020 Three Nine (in thousands) Operating lease cost $ 546 $ 1,638 $ 550 $ 1,676 Variable lease cost 135 441 121 405 Total lease cost $ 681 $ 2,079 $ 671 $ 2,081 Supplemental cash flow information related to leases was as follows: Three 9/30/2020 Nine 9/30/2020 Three Nine (in thousands) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 529 $ 1,586 $ 528 $ 1,605 Right-of-use Operating leases $ 431 $ 1,306 $ 433 $ 1,318 Supplemental balance sheet information related to leases was as follows: 9/30/2020 12/31/2019 (in thousands, except lease term and discount rate) Operating Leases: Operating lease right-of-use $ 14,124 $ 12,521 Operating lease liabilities $ 14,332 $ 12,690 Weighted Average Remaining Lease Term: Operating Leases 11 Years 11 Years Weighted Average Discount Rate: Operating Leases 3.1% 3.5% A summary of future minimum rental payments under such leases as the dates indicated follows: Minimum Rental Payments September 30, 2020 December 31, 2019 (in thousands) Year Ending December 31, 2020 $ 397 $ 2,030 2021 2,127 1,754 2022 1,975 1,603 2023 1,920 1,545 2024 1,666 1,277 Thereafter 8,565 7,312 Total lease payments $ 16,650 $ 15,521 Less imputed interest (2,318 ) (2,831 ) Present value of lease liability $ 14,332 $ 12,690 September 30, 2020 minimum rental payments represent three months of rental payments remaining in calendar year 2020.

Securities Available-for-Sale (

Securities Available-for-Sale (Tables)	9 Months Ended
	Sep. 30, 2020
Text Block [Abstract]
Summary of Securities Available-for-Sale	September 30, 2020 December 31, 2019 Amortized Gross Gross Fair Amortized Gross Gross Fair (in thousands) SBA Backed Securities $ 46,147 $ — $ 282 $ 45,865 $ 54,331 $ 23 $ 143 $ 54,211 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 189,531 767 394 189,904 184,580 139 532 184,187 Privately Issued Residential 347 1 7 341 397 1 2 396 Obligations Issued by States 48,815 — — 48,815 18,016 60 — 18,076 Other Debt Securities 6,600 113 6 6,707 3,600 51 19 3,632 Total $ 291,440 $ 881 $ 689 $ 291,632 $ 260,924 $ 274 $ 696 $ 260,502
Estimated Maturity Distribution of Securities Available-for-Sale	The following table shows the maturity distribution of the Company’s securities available-for-sale Amortized Fair (in thousands) Within one year $ 52,775 $ 52,763 After one but within five years 124,574 125,000 After five but within ten years 97,505 97,430 More than 10 years 16,586 16,439 Total $ 291,440 $ 291,632
Continuous Unrealized Loss Position for 12 Months or Less and 12 Months and Longer	The following table shows the temporarily impaired securities of the Company’s available-for-sale September 30, 2020 Less than 12 months 12 months or longer Total Temporarily Impaired Investments Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) SBA Backed Securities $ 16,625 $ 50 $ 29,240 $ 232 $ 45,865 $ 282 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 29,870 156 33,686 238 63,556 394 Privately Issued Residential Mortgage-Backed Securities 219 7 — — 219 7 Obligations Issued by States and Political Subdivisions — — — — — — Other Debt Securities — — 1,294 6 1,294 6 Total temporarily impaired securities $ 46,714 $ 213 $ 64,220 $ 476 $ 110,934 $ 689 The following table shows the temporarily impaired securities of the Company’s available-for-sale December 31, 2019 Less than 12 months 12 months or longer Total Temporarily Impaired Investments Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) SBA Backed Securities $ 14,560 $ 30 $ 22,092 $ 113 $ 36,652 $ 143 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 108,806 379 29,178 153 137,984 532 Privately Issued Residential Mortgage-Backed Securities 252 2 — — 252 2 Obligations Issued by States and Political Subdivisions — — — — — — Other Debt Securities 800 1 481 18 1,281 19 Total temporarily impaired securities $ 124,418 $ 412 $ 51,751 $ 284 $ 176,169 $ 696

Investment Securities Held-to_2

Investment Securities Held-to-Maturity (Tables)	9 Months Ended
	Sep. 30, 2020
Text Block [Abstract]
Summary of Held-to-Maturity Securities	September 30, 2020 December 31, 2019 Amortized Gross Gross Estimated Amortized Gross Gross Estimated Fair (in thousands) U.S. Government Sponsored Enterprises $ 248,211 $ 594 $ 494 $ 248,311 $ 98,867 $ 527 $ 96 $ 99,298 SBA Backed Securities 39,384 2,375 — 41,759 44,379 182 303 44,258 U.S. Government Sponsored Enterprises Mortgage- Backed Securities 2,119,581 76,185 889 2,194,877 2,207,874 20,720 10,846 2,217,748 Total $ 2,407,176 $ 79,154 $ 1,383 $ 2,484,947 $ 2,351,120 $ 21,429 $ 11,245 $ 2,361,304
Company's Securities Held-to-Maturity	The following table shows the maturity distribution of the Company’s securities held-to-maturity Amortized Fair (in thousands) Within one year $ 64,436 $ 64,929 After one but within five years 1,954,304 2,018,674 After five but within ten years 385,428 397,910 More than ten years 3,008 3,434 Total $ 2,407,176 $ 2,484,947
Unrealized Market Loss of Securities	The following table shows the temporarily impaired securities of the Company’s held-to-maturity September 30, 2020 Less Than 12 Months 12 Months or Longer Total Temporarily Impaired Investments Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) SBA Backed Securities $ — $ — $ — $ — $ — $ — US Government Sponsored Enterprises Mortgage-Backed Securities 128,240 494 — — 128,240 494 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 129,158 840 4,176 49 133,334 889 Total temporarily impaired securities $ 257,398 $ 1,334 $ 4,176 $ 49 $ 261,574 $ 1,383 The following table shows the temporarily impaired securities of the Company’s held-to-maturity December 31, 2019 Less Than 12 Months 12 Months or Longer Total Temporarily Impaired Investments Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) U.S. Treasury $ — $ — $ — $ — $ — $ — U.S. Government Sponsored Enterprises 24,420 72 9,976 24 34,396 96 SBA Backed Securities 25,251 303 — — 25,251 303 U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities 613,905 3,949 389,919 6,897 1,003,824 10,846 Total temporarily impaired securities $ 663,576 $ 4,324 $ 399,895 $ 6,921 $ 1,063,471 $ 11,245

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Analysis of the allowance for loan losses	The following table summarizes the changes in the Company’s allowance for loan losses for the periods indicated. Three months ended Nine months ended 2020 2019 2020 2019 (in thousands) Allowance for loan losses, beginning of period $ 32,516 $ 29,070 $ 29,585 $ 28,543 Loans charged off (41 ) (118 ) (120 ) (336 ) Recoveries on loans previously charged-off 19 70 254 190 Net recoveries (charge-offs) (22 ) (48 ) 134 (146 ) Provision charged to expense 900 75 3,675 700 Allowance for loan losses, end of period $ 33,394 $ 29,097 $ 33,394 $ 29,097
Summary of Allowance for Loan Losses	Further information pertaining to the allowance for loan losses for the three months ending September 30, 2020 is as follows: Construction Commercial Municipal Commercial Residential Consumer Home Unallocated Total Allowance for loan losses: (in thousands) Balance at June 30, 2020 $ 289 $ 13,121 $ 2,868 $ 11,303 $ 3,094 $ 289 $ 1,465 $ 87 $ 32,516 Charge-offs — (20 ) — — — (21 ) — — (41 ) Recoveries — 12 — — — 7 — — 19 Provision 76 2,731 (300 ) (522 ) (958 ) 35 (200 ) 38 900 Ending balance at September 30, 2020 $ 365 $ 15,844 $ 2,568 $ 10,781 $ 2,136 $ 310 $ 1,265 $ 125 $ 33,394 Amount of allowance for loan losses for loans deemed to be impaired $ — $ 12 $ — $ 75 $ — $ — $ — $ — $ 87 Amount of allowance for loan losses for loans not deemed to be impaired $ 365 $ 15,832 $ 2,568 $ 10,706 $ 2,136 $ 310 $ 1,265 $ 125 $ 33,307 Loans: Ending balance $ 9,116 $ 1,315,407 $ 130,047 $ 784,895 $ 443,703 $ 19,866 $ 287,099 $ — $ 2,990,133 Loans deemed to be impaired $ — $ 160 $ — $ 2,675 $ 236 $ — $ — $ — $ 3,071 Loans not deemed to be impaired $ 9,116 $ 1,315,247 $ 130,047 $ 782,220 $ 443,467 $ 19,866 $ 287,099 $ — $ 2,987,062 Further information pertaining to the allowance for loan losses for the nine months ending September 30, 2020 is as follows: Construction Commercial Municipal Commercial Residential Consumer Home Unallocated Total Allowance for loan losses: (in thousands) Balance at December 31, 2019 $ 331 $ 11,596 $ 2,566 $ 11,464 $ 2,194 $ 312 $ 1,065 $ 57 $ 29,585 Charge-offs — (31 ) — — — (89 ) — — (120 ) Recoveries — 182 — — — 67 5 — 254 Provision 34 4,097 2 (683 ) (58 ) 20 195 68 3,675 Ending balance at September 30, 2020 $ 365 $ 15,844 $ 2,568 $ 10,781 $ 2,136 $ 310 $ 1,265 $ 125 $ 33,394 Amount of allowance for loan losses for loans deemed to be impaired $ — $ 12 $ — $ 75 $ — $ — $ — $ — $ 87 Amount of allowance for loan losses for loans not deemed to be impaired $ 365 $ 15,832 $ 2,568 $ 10,706 $ 2,136 $ 310 $ 1,265 $ 125 $ 33,307 Loans: Ending balance $ 9,116 $ 1,315,407 $ 130,047 $ 784,895 $ 443,703 $ 19,866 $ 287,099 $ — $ 2,990,133 Loans deemed to be impaired $ — $ 160 $ — $ 2,675 $ 236 $ — $ — $ — $ 3,071 Loans not deemed to be impaired $ 9,116 $ 1,315,247 $ 130,047 $ 782,220 $ 443,467 $ 19,866 $ 287,099 $ — $ 2,987,062 Further information pertaining to the allowance for loan losses for the three months ending September 30, 2019 is as follows: Construction Commercial Municipal Commercial Residential Consumer Home Unallocated Total Allowance for loan losses: (in thousands) Balance at June 30, 2019 $ 1,052 $ 11,338 $ 1,832 $ 10,848 $ 2,210 $ 380 $ 1,120 $ 290 $ 29,070 Charge-offs — (57 ) — — — (61 ) — — (118 ) Recoveries — 23 — — — 47 — — 70 Provision (752 ) 9 751 53 (24 ) (84 ) (33 ) 155 75 Ending balance at September 30, 2019 $ 300 $ 11,313 $ 2,583 $ 10,901 $ 2,186 $ 282 $ 1,087 $ 445 $ 29,097 Amount of allowance for loan losses for loans deemed to be impaired $ — $ 2 $ — $ 86 $ — $ — $ — $ — $ 88 Amount of allowance for loan losses for loans not deemed to be impaired $ 300 $ 11,311 $ 2,583 $ 10,815 $ 2,186 $ 282 $ 1,087 $ 445 $ 29,009 Loans: Ending balance $ 7,824 $ 783,950 $ 121,802 $ 765,385 $ 364,317 $ 21,748 $ 310,635 $ — $ 2,375,661 Loans deemed to be impaired $ — $ 203 $ — $ 2,373 $ — $ — $ — $ — $ 2,576 Loans not deemed to be impaired $ 7,824 $ 783,747 $ 121,802 $ 763,012 $ 364,317 $ 21,748 $ 310,635 $ — $ 2,373,085 Further information pertaining to the allowance for loan losses for the nine months ending September 30, 2019 is as follows: Construction Commercial Municipal Commercial Residential Consumer Home Unallocated Total Allowance for loan losses: (in thousands) Balance at December 31, 2018 $ 1,092 $ 10,998 $ 1,838 $ 10,663 $ 2,190 $ 365 $ 1,111 $ 286 $ 28,543 Charge-offs — (108 ) — — — (228 ) — — (336 ) Recoveries — 49 — — — 141 — — 190 Provision (792 ) 374 745 238 (4 ) 4 (24 ) 159 700 Ending balance at September 30, 2019 $ 300 $ 11,313 $ 2,583 $ 10,901 $ 2,186 $ 282 $ 1,087 $ 445 $ 29,097 Amount of allowance for loan losses for loans deemed to be impaired $ — $ 2 $ — $ 86 $ — $ — $ — $ — $ 88 Amount of allowance for loan losses for loans not deemed to be impaired $ 300 $ 11,311 $ 2,583 $ 10,815 $ 2,186 $ 282 $ 1,087 $ 445 $ 29,009 Loans: Ending balance $ 7,824 $ 783,950 $ 121,802 $ 765,385 $ 364,317 $ 21,748 $ 310,635 $ — $ 2,375,661 Loans deemed to be impaired $ — $ 203 $ — $ 2,373 $ — $ — $ — $ — $ 2,576 Loans not deemed to be impaired $ 7,824 $ 783,747 $ 121,802 $ 763,012 $ 364,317 $ 21,748 $ 310,635 $ — $ 2,373,085
Loans by Risk Rating	The following table presents the Company’s loans by risk rating at September 30, 2020. Construction Commercial Municipal Commercial Grade: (in thousands) 1-3 $ 9,116 $ 1,308,693 $ 130,047 $ 757,953 4 (Monitor) — 6,554 — 24,267 5 (Substandard) — — — — 6 (Doubtful) — — — — Impaired — 160 — 2,675 Total $ 9,116 $ 1,315,407 $ 130,047 $ 784,895 The following table presents the Company’s loans by risk rating at December 31, 2019. Construction Commercial Municipal Commercial Grade: (in thousands) 1-3 $ 8,992 $ 807,486 $ 120,455 $ 759,402 4 (Monitor) — 4,025 — 24,354 5 (Substandard) — — — — 6 (Doubtful) — — — — Impaired — 906 — 2,346 Total $ 8,992 $ 812,417 $ 120,455 $ 786,102
Loans by Credit Rating	Credit ratings issued by national organizations were utilized as credit quality indicators as presented in the following table at September 30, 2020 and are included within the total loan portfolio. Commercial Municipal Commercial Total Credit Rating: (in thousands) Aaa – Aa3 $ 647,056 $ 64,806 $ 38,365 $ 750,227 A1 – A3 184,409 7,228 145,467 337,104 Baa1 – Baa3 50,000 51,133 140,486 241,619 Ba2 — 5,080 — 5,080 Total $ 881,465 $ 128,247 $ 324,318 $ 1,334,030 Credit ratings issued by national organizations were utilized as credit quality indicators as presented in the following table at December 31, 2019. Commercial Municipal Commercial Total Credit Rating: (in thousands) Aaa – Aa3 $ 523,644 $ 53,273 $ 40,437 $ 617,354 A1 – A3 186,044 7,354 148,346 341,744 Baa1 – Baa3 — 51,133 144,711 195,844 Ba2 — 5,895 — 5,895 Total $ 709,688 $ 117,655 $ 333,494 $ 1,160,837
Aging of Past Due Loan Losses	Further information pertaining to the allowance for loan losses at September 30, 2020 follows: Accruing 30-89 Days Non Accruing Total Current Total (in thousands) Construction and land development $ — $ — $ — $ — $ 9,116 $ 9,116 Commercial and industrial 623 3 — 626 1,314,781 1,315,407 Municipal — — — — 130,047 130,047 Commercial real estate 3,596 593 49 4,238 780,657 784,895 Residential real estate 569 532 — 1,101 442,602 443,703 Consumer and overdrafts 15 — — 15 19,851 19,866 Home equity 1,206 291 — 1,497 285,602 287,099 Total $ 6,009 $ 1,419 $ 49 $ 7,477 $ 2,982,656 $ 2,990,133 Further information pertaining to the allowance for loan losses at December 31, 2019 follows: Accruing 30-89 Days Non Accruing Total Current Total (in thousands) Construction and land development $ — $ — $ — $ — $ 8,992 $ 8,992 Commercial and industrial 227 400 — 627 811,790 812,417 Municipal — — — — 120,455 120,455 Commercial real estate 840 492 — 1,332 784,770 786,102 Residential real estate 1,563 683 — 2,246 369,651 371,897 Consumer and overdrafts 18 4 — 22 21,871 21,893 Home equity 603 435 — 1,038 303,325 304,363 Total $ 3,251 $ 2,014 $ — $ 5,265 $ 2,420,854 $ 2,426,119
Information Pertaining to Impaired Loans	The following is information pertaining to impaired loans for September 30, 2020: Carrying Unpaid Required Average Interest Average Interest With no required reserve recorded: (in thousands) Construction and land development $ — $ — $ — $ — $ — $ — $ — Commercial and industrial 67 88 — 73 — 288 2 Municipal — — — — — — — Commercial real estate 592 624 — 601 — 365 — Residential real estate 236 236 — 236 — 118 — Consumer — — — — — — — Home equity — — — — — — — Total $ 895 $ 948 $ — $ 910 $ — $ 771 $ 2 With required reserve recorded: Construction and land development $ — $ — $ — $ — $ — $ — $ — Commercial and industrial 93 93 12 100 1 95 3 Municipal — — — — — — — Commercial real estate 2,083 2,209 75 2,094 21 2,140 65 Residential real estate — — — — — — — Consumer — — — — — — — Home equity — — — — — — — Total $ 2,176 $ 2,302 $ 87 $ 2,194 $ 22 $ 2,235 $ 68 Total: Construction and land development $ — $ — $ — $ — $ — $ — $ — Commercial and industrial 160 181 12 173 1 383 5 Municipal — — — — — — — Commercial real estate 2,675 2,833 75 2,695 21 2,505 65 Residential real estate 236 236 — 236 — 118 — Consumer — — — — — — — Home equity — — — — — — — Total $ 3,071 $ 3,250 $ 87 $ 3,104 $ 22 $ 3,006 $ 70 The following is information pertaining to impaired loans for September 30, 2019: Carrying Unpaid Required Average Interest Average Interest With no required reserve recorded: (in thousands) Construction and land development $ — $ — $ — $ — $ — $ — $ — Commercial and industrial 87 306 — 89 2 87 6 Municipal — — — — — — — Commercial real estate 167 194 — 729 — 529 — Residential real estate — — — — — — — Consumer — — — — — — — Home equity — — — — — — — Total $ 254 $ 500 $ — $ 818 $ 2 $ 616 $ 6 With required reserve recorded: Construction and land development $ — $ — $ — $ — $ — $ — $ — Commercial and industrial 116 116 2 310 2 299 6 Municipal — — — — — — — Commercial real estate 2,206 2,326 86 2,140 23 2,350 67 Residential real estate — — — — — — — Consumer — — — — — — — Home equity — — — — — — — Total $ 2,322 $ 2,442 $ 88 $ 2,450 $ 25 $ 2,649 $ 73 Total: Construction and land development $ — $ — $ — $ — $ — $ — $ — Commercial and industrial 203 422 2 399 4 386 12 Municipal — — — — — — — Commercial real estate 2,373 2,520 86 2,869 23 2,879 67 Residential real estate — — — — — — — Consumer — — — — — — — Home equity — — — — — — — Total $ 2,576 $ 2,942 $ 88 $ 3,268 $ 27 $ 3,265 $ 79

Reclassifications Out of Accu_2

Reclassifications Out of Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2020
Text Block [Abstract]
Reclassifications Out of Accumulated Other Comprehensive Income	Amount Reclassified from Accumulated Other Comprehensive Income Details about Accumulated Other Three Three Affected Line Item in the Statement where Net (in thousands) Unrealized gains and losses on available-for-sale $ — $ 54 Net gains on sales of investments — (15 ) Provision for income taxes $ — $ 39 Net income Accretion of unrealized losses transferred $ (196 ) $ (209 ) Interest on securities held-to-maturity 51 54 Provision for income taxes $ (145 ) $ (155 ) Net income Amortization of defined benefit Prior-service costs $ (29 ) (b) $ (29 ) (b) Salaries and employee benefits Actuarial gains (losses) (472 ) (b) (337 ) (b) Salaries and employee benefits Total before tax (501 ) (366 ) Income before taxes Tax (expense) or benefit 141 103 Provision for income taxes Net of tax $ (360 ) $ (263 ) Net income Details about Accumulated Other Nine Nine Affected Line Item in the Statement where Net (in thousands) Unrealized gains and losses on available-for-sale $ — $ 61 Net gains on sales of investments — (17 ) Provision for income taxes $ — $ 44 Net income Accretion of unrealized losses transferred $ (637 ) $ (779 ) Interest on securities held-to-maturity 166 205 Provision for income taxes $ (471 ) $ (574 ) Net income Amortization of defined benefit Prior-service costs $ (86 ) (b) $ (86 ) (b) Salaries and employee benefits Actuarial gains (losses) (1,417 ) (b) (1,013 ) (b) Salaries and employee benefits Total before tax (1,503 ) (1,099 ) Income before taxes Tax (expense) or benefit 422 309 Provision for income taxes Net of tax $ (1,081 ) $ (790 ) Net income (a) Amount in parentheses indicates reductions to net income. (b) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Employee Benefits footnote (Note 7) for additional details).

Earnings per share ("EPS") (Tab

Earnings per share ("EPS") (Tables)	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Reconciliation of Basic EPS and Diluted EPS	The following table is a reconciliation of basic EPS and diluted EPS. Three Months Ended Nine Months Ended (in thousands except share and per share data) 2020 2019 2020 2019 Basic EPS Computation: Numerator: Net income, Class A $ 8,630 $ 7,986 $ 24,254 $ 22,853 Net income, Class B 2,257 2,098 6,355 6,114 Denominator: Weighted average shares outstanding, Class A 3,655,469 3,650,449 3,653,429 3,627,076 Weighted average shares outstanding, Class B 1,912,440 1,917,460 1,914,480 1,940,833 Basic EPS, Class A $ 2.36 $ 2.19 $ 6.64 $ 6.30 Basic EPS, Class B 1.18 1.09 3.32 3.15 Diluted EPS Computation: Numerator: Net income, Class A $ 8,630 $ 7,986 $ 24,254 $ 22,853 Net income, Class B 2,257 2,098 6,355 6,114 Total net income, for diluted EPS, Class A computation 10,887 10,084 30,609 28,967 Denominator: Weighted average shares outstanding, basic, Class A 3,655,469 3,650,449 3,653,429 3,627,076 Weighted average shares outstanding, Class B 1,912,440 1,917,460 1,914,480 1,940,833 Weighted average shares outstanding diluted, Class A 5,567,909 5,567,909 5,567,909 5,567,909 Weighted average shares outstanding, Class B 1,912,440 1,917,460 1,914,480 1,940,833 Diluted EPS, Class A $ 1.96 $ 1.81 $ 5.50 $ 5.20 Diluted EPS, Class B 1.18 1.09 3.32 3.15

Employee Benefits (Tables)

Employee Benefits (Tables)	9 Months Ended
	Sep. 30, 2020
Retirement Benefits [Abstract]
Components of Net Periodic Benefit Cost	Components of Net Periodic Benefit Cost for the Three Months Ended September 30, Pension Benefits Supplemental Insurance/ 2020 2019 2020 2019 (in thousands) Service cost $ 344 $ 276 $ 353 $ 256 Interest 450 473 466 482 Expected return on plan assets (952 ) (819 ) — — Recognized prior service cost (benefit) — — 29 28 Recognized net actuarial losses 261 229 211 109 Net periodic benefit (credit) cost $ 103 $ 159 $ 1,059 $ 875 Components of Net Periodic Benefit Cost for the Nine Months Ended September 30, Pension Benefits Supplemental Insurance/ 2020 2019 2020 2019 (in thousands) Service cost $ 1,032 $ 828 $ 1,059 $ 768 Interest 1,350 1,419 1,398 1,445 Expected return on plan assets (2,856 ) (2,457 ) — — Recognized prior service cost (benefit) — — 87 86 Recognized net actuarial losses 783 687 633 326 Net periodic benefit (credit) cost $ 309 $ 477 $ 3,177 $ 2,625

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Financial Instruments Measured at Fair Value on a Recurring and Non-recurring Basis	The results of the fair value hierarchy as of September 30, 2020, are as follows: Fair Value Measurements Using Carrying Quoted Prices Significant Significant (in thousands) Financial Instruments Measured at Fair Value on a Recurring Basis Securities AFS SBA Backed Securities $ 45,865 $ — $ 45,865 $ — U.S. Government Agency and Sponsored 189,904 — 189,904 — Privately Issued Residential Mortgage- 341 — 341 — Obligations Issued by States and 48,815 — — 48,815 Other Debt Securities 6,707 — 6,707 — Total $ 291,632 $ — $ 242,817 $ 48,815 Equity Securities $ 1,645 $ 276 $ 1,369 $ — Financial Instruments Measured at Fair Value Non-recurring Impaired Loans $ 828 $ — $ — $ 828 The results of the fair value hierarchy as of December 31, 2019, are as follows: Securities AFS Fair Value Measurements Using Carrying Quoted Prices Significant Significant (in thousands) Financial Instruments Measured at Fair Value on a Recurring Basis: SBA Backed Securities $ 54,211 $ — $ 54,211 $ — U.S. Government Agency and Sponsored 184,187 — 184,187 — Privately Issued Residential Mortgage- 396 — 396 — Obligations Issued by States and 18,076 — 4,775 13,301 Other Debt Securities 3,632 3,632 — Total $ 260,502 $ — $ 247,201 $ 13,301 Financial Instruments Measured at Fair Value on a Recurring Basis Equity Securities $ 1,688 $ 343 $ 1,345 $ — Financial Instruments Measured at Fair Value on a Non-recurring $ 877 $ — $ — $ 877
Assets Measured at Fair Value	The following table presents additional information about assets measured at fair value on a recurring and nonrecurring basis for which the Company has utilized Level 3 inputs to determine fair value (dollars in thousands). Management continues to monitor the assumptions used to value the assets listed below. Asset Fair Value Valuation Technique Unobservable Input Unobservable Input Securities AFS $ 48,815 Discounted cash flow Discount rate 0%-1% (3) Impaired Loans $ 828 Appraisal Appraisal 0% (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated expenses. (3) Weighted averages. The following table presents additional information about assets measured at fair value on a recurring and nonrecurring basis for which the Company has utilized Level 3 inputs to determine fair value (dollars in thousands). Management continues to monitor the assumptions used to value the assets listed below. Asset Fair Value Valuation Technique Unobservable Input Unobservable Input Securities AFS $ 13,301 Discounted cash flow Discount rate 1.5%-3.2% (3) Impaired Loans $ 877 Appraisal Appraisal 0%-30% discount (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated expenses. (3) Weighted averages.
Changes in Level 3 Securities	The changes in Level 3 securities for the nine month period ended September 30, 2020 are shown in the table below: Obligations Balance at December 31, 2019 $ 13,301 Purchases 53,903 Maturities and calls (18,357 ) Amortization (32 ) Balance at September 30, 2020 $ 48,815 The changes in Level 3 securities for the nine month period ended September 30, 2019, are shown in the table below: Obligations Balance at December 31, 2018 $ 88,728 Purchases 13,290 Maturities and calls (78,196 ) Amortization (21 ) Changes in fair value — Balance at September 30, 2019 $ 23,801

Fair Values of Financial Inst_2

Fair Values of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2020
Investments, All Other Investments [Abstract]
Carrying Amounts and Fair Values of Company's Financial Instruments	September 30, 2020 Carrying Amount Estimated Fair Value Measurements Level 2 Inputs Level 3 Inputs (in thousands) Financial assets: Securities held-to-maturity $ 2,407,176 $ 2,484,947 $ — $ 2,484,947 $ — Loans (1) 2,956,739 2,885,187 — — 2,885,187 Financial liabilities: Time deposits 581,866 596,675 — 596,675 — Other borrowed funds 152,248 159,690 — 159,690 — Subordinated debentures 36,083 36,083 — 36,083 — December 31, 2019 Financial assets: Securities held-to-maturity $ 2,351,120 $ 2,361,304 $ — $ 2,361,304 $ — Loans (1) 2,396,534 2,424,770 — — 2,424,770 Financial liabilities: Time deposits 555,447 560,746 — 560,746 — Other borrowed funds 370,955 374,531 — 374,531 — Subordinated debentures 36,083 36,083 — 36,083 — (1) Comprised of loans (including collateral dependent impaired loans), net of deferred loan costs and the allowance for loan losses.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Schedule of Revenue From Contracts	The following table presents total revenues as presented in the Consolidated Statements of Income and the related amounts which are from contracts with customers within the scope of Topic 606. As illustrated here, the vast majority of our revenues are specifically excluded from the scope of Topic 606. Nine 9/30/2020 Revenue from Nine Revenue from (dollars in thousands) Total net interest income $ 78,350 $ — $ 70,458 $ — Noninterest income: Service charges on deposit accounts 6,558 6,558 6,801 6,801 Lockbox fees 2,850 2,850 3,018 3,018 Net gains on sales of securities — — 61 — Gains on sales of mortgage loans — — 154 — Other income 3,112 1,738 3,676 2,338 Total noninterest income 12,520 11,146 13,710 12,157 Total revenues $ 90,870 $ 11,146 $ 84,168 $ 12,157 Three 9/30/2020 Revenue from Three Revenue from (dollars in thousands) Total interest income $ 27,331 $ — $ 23,770 $ — Noninterest income: Service charges on deposit accounts 2,239 2,239 2,310 2,310 Lockbox fees 996 996 937 937 Net gains on sales of securities — — 53 — Gains on sales of mortgage loans — — — — Other income 934 580 986 728 Total noninterest income 4,169 3,815 4,286 3,975 Total revenues $ 31,500 $ 3,815 $ 28,056 $ 3,975
Information about Receivables with Customers	The following table provides information about receivables with customers. September 30, 2020 December 31, 2019 (dollars in thousands) Receivables, which are included in “Other assets” $ 1,362 $ 1,200

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Components of lease expense	The components of lease expense were as follows: Three 9/30/2020 Nine 9/30/2020 Three Nine (in thousands) Operating lease cost $ 546 $ 1,638 $ 550 $ 1,676 Variable lease cost 135 441 121 405 Total lease cost $ 681 $ 2,079 $ 671 $ 2,081
Supplemental cash flow information related to leases	Supplemental cash flow information related to leases was as follows: Three 9/30/2020 Nine 9/30/2020 Three Nine (in thousands) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 529 $ 1,586 $ 528 $ 1,605 Right-of-use Operating leases $ 431 $ 1,306 $ 433 $ 1,318
Supplemental balance sheet information related to leases	Supplemental balance sheet information related to leases was as follows: 9/30/2020 12/31/2019 (in thousands, except lease term and discount rate) Operating Leases: Operating lease right-of-use $ 14,124 $ 12,521 Operating lease liabilities $ 14,332 $ 12,690 Weighted Average Remaining Lease Term: Operating Leases 11 Years 11 Years Weighted Average Discount Rate: Operating Leases 3.1% 3.5%
Maturities of lease liabilities	A summary of future minimum rental payments under such leases as the dates indicated follows: Minimum Rental Payments September 30, 2020 December 31, 2019 (in thousands) Year Ending December 31, 2020 $ 397 $ 2,030 2021 2,127 1,754 2022 1,975 1,603 2023 1,920 1,545 2024 1,666 1,277 Thereafter 8,565 7,312 Total lease payments $ 16,650 $ 15,521 Less imputed interest (2,318 ) (2,831 ) Present value of lease liability $ 14,332 $ 12,690

Basis of Financial Statement _2

Basis of Financial Statement Presentation - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2020Segment
Number of Reportable Segments	1
Century Bancorp Capital Trust II [Member]
Equity ownership interest	100.00%

Securities Available-for-Sale -

Securities Available-for-Sale - Summary of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 291,440	$ 260,924
Gross Unrealized Gains	881	274
Gross Unrealized Losses	689	696
Total, Fair Value	291,632	260,502
SBA Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	46,147	54,331
Gross Unrealized Gains	0	23
Gross Unrealized Losses	282	143
Total, Fair Value	45,865	54,211
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	189,531	184,580
Gross Unrealized Gains	767	139
Gross Unrealized Losses	394	532
Total, Fair Value	189,904	184,187
Privately Issued Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	347	397
Gross Unrealized Gains	1	1
Gross Unrealized Losses	7	2
Total, Fair Value	341	396
Obligations Issued by States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	48,815	18,016
Gross Unrealized Gains	0	60
Total, Fair Value	48,815	18,076
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,600	3,600
Gross Unrealized Gains	113	51
Gross Unrealized Losses	6	19
Total, Fair Value	$ 6,707	$ 3,632

Securities Available-for-Sale_2

Securities Available-for-Sale - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)Security	Sep. 30, 2019USD ($)	Dec. 31, 2019USD ($)Security
Schedule of Available-for-sale Securities [Line Items]
Securities at fair value pledged to secure public deposits and repurchase agreements		$ 1,722,363,000		$ 1,776,399,000
Securities available-for-sale are securities at fair value pledged for borrowing		30,112,000		32,297,000
Gross gains on sales of securities	$ 53,000	13,000	$ 61,000
Proceeds from sales of securities available-for-sale		16,285,000	$ 16,285,000
Securities at floating rate or adjustable rate		236,600,000
Sales of securities available for sale		0
Federal Reserve Bank Discount Window [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available-for-sale are securities at fair value pledged for borrowing		$ 9,433,000		$ 0
Securities AFS [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted average remaining life of investment securities available-for-sale		4 years 8 months 12 days
Number of securities, temporarily impaired for less than 12 months | Security		14		45
Number of securities, temporarily impaired for 12 months or longer | Security		20		18
Number of securities, temporarily impaired, total | Security		148		122
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities at fair value pledged to secure public deposits and repurchase agreements		$ 196,225,000		$ 186,245,000

Securities Available-for-Sale_3

Securities Available-for-Sale - Estimated Maturity Distribution of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Within one year, Amortized Cost	$ 52,775
After one but within five years, Amortized Cost	124,574
After five but within ten years, Amortized Cost	97,505
More than ten years, Amortized Cost	16,586
Amortized Cost	291,440	$ 260,924
Within one year, Fair Value	52,763
After one but within five years, Fair Value	125,000
After five but within ten years, Fair Value	97,430
More than ten years, Fair Value	16,439
Total, Fair Value	$ 291,632	$ 260,502

Securities Available-for-Sale_4

Securities Available-for-Sale - Continuous Unrealized Loss Position for 12 Months or Less and 12 Months and Longer (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	$ 46,714	$ 124,418
Less Than 12 Months, Unrealized Losses	213	412
12 Months or Longer, Fair Value	64,220	51,751
12 Months or Longer, Unrealized Losses	476	284
Total, Fair Value	110,934	176,169
Total, Unrealized Losses	689	696
SBA Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	16,625	14,560
Less Than 12 Months, Unrealized Losses	50	30
12 Months or Longer, Fair Value	29,240	22,092
12 Months or Longer, Unrealized Losses	232	113
Total, Fair Value	45,865	36,652
Total, Unrealized Losses	282	143
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	29,870	108,806
Less Than 12 Months, Unrealized Losses	156	379
12 Months or Longer, Fair Value	33,686	29,178
12 Months or Longer, Unrealized Losses	238	153
Total, Fair Value	63,556	137,984
Total, Unrealized Losses	394	532
Privately Issued Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	219	252
Less Than 12 Months, Unrealized Losses	7	2
Total, Fair Value	219	252
Total, Unrealized Losses	7	2
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value		800
Less Than 12 Months, Unrealized Losses		1
12 Months or Longer, Fair Value	1,294	481
12 Months or Longer, Unrealized Losses	6	18
Total, Fair Value	1,294	1,281
Total, Unrealized Losses	$ 6	$ 19

Investment Securities Held-to_3

Investment Securities Held-to-Maturity - Summary of Held-to-Maturity Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 2,407,176	$ 2,351,120
Gross Unrealized Gains	79,154	21,429
Gross Unrealized Losses	1,383	11,245
Estimated Fair Value	2,484,947	2,361,304
U.S. Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	248,211	98,867
Gross Unrealized Gains	594	527
Gross Unrealized Losses	494	96
Estimated Fair Value	248,311	99,298
SBA Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	39,384	44,379
Gross Unrealized Gains	2,375	182
Gross Unrealized Losses	0	303
Estimated Fair Value	41,759	44,258
U.S. Government Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,119,581	2,207,874
Gross Unrealized Gains	76,185	20,720
Gross Unrealized Losses	889	10,846
Estimated Fair Value	$ 2,194,877	$ 2,217,748

Investment Securities Held-to_4

Investment Securities Held-to-Maturity - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2020USD ($)Security	Sep. 30, 2019USD ($)	Dec. 31, 2019USD ($)Security
Schedule of Held-to-maturity Securities [Line Items]
Securities at fair value pledged to secure public deposits and repurchase agreements	$ 1,722,363,000		$ 1,776,399,000
Securities pledged for borrowing at the Federal Home Loan Bank	156,360,000		$ 0
Securities held to maturity at floating rate or adjustable rate	89,000
Sales of held-to-maturity securities		$ 1,194,000
Commercial Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Gross realised gains on sale of held to maturity securities		48,000
Sales of held-to-maturity securities	$ 0	$ 1,194,000
Held-to-Maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Weighted average remaining life of investment securities held-to-maturity	3 years 7 months 6 days
Number of securities, temporarily impaired for less than 12 months | Security	30		114
Number of securities, temporarily impaired for 12 months or longer | Security	3		103
Number of securities, temporarily impaired, total | Security	576		531
Held-to-Maturity Securities [Member] | U.S. Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Weighted average remaining life	$ 207,730,000
Federal Home Loan Bank [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities pledged for borrowing at the Federal Home Loan Bank	$ 597,810,000		$ 399,646,000

Investment Securities Held-to_5

Investment Securities Held-to-Maturity - Company's Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Within one year, Amortized Cost	$ 64,436
After one but within five years, Amortized Cost	1,954,304
After five but within ten years, Amortized Cost	385,428
More than ten years, Amortized Cost	3,008
Amortized Cost	2,407,176	$ 2,351,120
Within one year, Fair Value	64,929
After one but within five years, Fair Value	2,018,674
After five but within ten years, Fair Value	397,910
More than ten years, Fair Value	3,434
Estimated Fair Value	$ 2,484,947	$ 2,361,304

Investment Securities Held-to_6

Investment Securities Held-to-Maturity - Unrealized Market Loss of Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Less Than 12 Months, Fair Value	$ 257,398	$ 663,576
Less Than 12 Months, Unrealized Losses	1,334	4,324
12 Months or Longer, Fair Value	4,176	399,895
12 Months or Longer, Unrealized Losses	49	6,921
Total, Fair Value	261,574	1,063,471
Total, Unrealized Losses	1,383	11,245
US Government Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less Than 12 Months, Fair Value	128,240	24,420
Less Than 12 Months, Unrealized Losses	494	72
12 Months or Longer, Fair Value		9,976
12 Months or Longer, Unrealized Losses		24
Total, Fair Value	128,240	34,396
Total, Unrealized Losses	494	96
SBA Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less Than 12 Months, Fair Value	0	25,251
Less Than 12 Months, Unrealized Losses	0	303
Total, Fair Value	0	25,251
Total, Unrealized Losses	0	303
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less Than 12 Months, Fair Value	129,158	613,905
Less Than 12 Months, Unrealized Losses	840	3,949
12 Months or Longer, Fair Value	4,176	389,919
12 Months or Longer, Unrealized Losses	49	6,897
Total, Fair Value	133,334	1,003,824
Total, Unrealized Losses	$ 889	$ 10,846

Allowance for Loan Losses - Ana

Allowance for Loan Losses - Analysis of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Receivables [Abstract]
Allowance for loan losses, beginning of period	$ 32,516	$ 29,070	$ 29,585	$ 28,543
Loans charged-off	(41)	(118)	(120)	(336)
Recoveries on loans previously charged-off	19	70	254	190
Net recoveries (charge-offs)	(22)	(48)	134	(146)
Provision charged to expense	900	75	3,675	700
Allowance for loan losses, end of period	$ 33,394	$ 29,097	$ 33,394	$ 29,097

Allowance for Loan Losses - Sum

Allowance for Loan Losses - Summary of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	$ 32,516	$ 29,070	$ 29,585	$ 28,543
Charge-offs	(41)	(118)	(120)	(336)
Recoveries	19	70	254	190
Provision	900	75	3,675	700
Allowance for loan losses, end of period	33,394	29,097	33,394	29,097
Amount of allowance for loan losses for loans deemed to be impaired	87	88	87	88
Amount of allowance for loan losses for loans not deemed to be impaired	33,307	29,009	33,307	29,009
Loans:
Total loans, net	2,990,133	2,375,661	2,990,133	2,375,661	$ 2,426,119
Loans deemed to be impaired	3,071	2,576	3,071	2,576
Loans not deemed to be impaired	2,987,062	2,373,085	2,987,062	2,373,085
Construction and Land Development [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	289	1,052	331	1,092
Provision	76	(752)	34	(792)
Allowance for loan losses, end of period	365	300	365	300
Amount of allowance for loan losses for loans not deemed to be impaired	365	300	365	300
Loans:
Total loans, net	9,116	7,824	9,116	7,824	8,992
Loans not deemed to be impaired	9,116	7,824	9,116	7,824
Commercial and Industrial [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	13,121	11,338	11,596	10,998
Charge-offs	(20)	(57)	(31)	(108)
Recoveries	12	23	182	49
Provision	2,731	9	4,097	374
Allowance for loan losses, end of period	15,844	11,313	15,844	11,313
Amount of allowance for loan losses for loans deemed to be impaired	12	2	12	2
Amount of allowance for loan losses for loans not deemed to be impaired	15,832	11,311	15,832	11,311
Loans:
Total loans, net	1,315,407	783,950	1,315,407	783,950	812,417
Loans deemed to be impaired	160	203	160	203
Loans not deemed to be impaired	1,315,247	783,747	1,315,247	783,747
Municipal [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	2,868	1,832	2,566	1,838
Provision	(300)	751	2	745
Allowance for loan losses, end of period	2,568	2,583	2,568	2,583
Amount of allowance for loan losses for loans not deemed to be impaired	2,568	2,583	2,568	2,583
Loans:
Total loans, net	130,047	121,802	130,047	121,802	120,455
Loans not deemed to be impaired	130,047	121,802	130,047	121,802
Commercial Real Estate [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	11,303	10,848	11,464	10,663
Provision	(522)	53	(683)	238
Allowance for loan losses, end of period	10,781	10,901	10,781	10,901
Amount of allowance for loan losses for loans deemed to be impaired	75	86	75	86
Amount of allowance for loan losses for loans not deemed to be impaired	10,706	10,815	10,706	10,815
Loans:
Total loans, net	784,895	765,385	784,895	765,385	786,102
Loans deemed to be impaired	2,675	2,373	2,675	2,373
Loans not deemed to be impaired	782,220	763,012	782,220	763,012
Residential Real Estate [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	3,094	2,210	2,194	2,190
Provision	(958)	(24)	(58)	(4)
Allowance for loan losses, end of period	2,136	2,186	2,136	2,186
Amount of allowance for loan losses for loans not deemed to be impaired	2,136	2,186	2,136	2,186
Loans:
Total loans, net	443,703	364,317	443,703	364,317	371,897
Loans deemed to be impaired	236		236
Loans not deemed to be impaired	443,467	364,317	443,467	364,317
Consumer [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	289	380	312	365
Charge-offs	(21)	(61)	(89)	(228)
Recoveries	7	47	67	141
Provision	35	(84)	20	4
Allowance for loan losses, end of period	310	282	310	282
Amount of allowance for loan losses for loans not deemed to be impaired	310	282	310	282
Loans:
Total loans, net	19,866	21,748	19,866	21,748	21,893
Loans not deemed to be impaired	19,866	21,748	19,866	21,748
Home Equity [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	1,465	1,120	1,065	1,111
Recoveries	0		5
Provision	(200)	(33)	195	(24)
Allowance for loan losses, end of period	1,265	1,087	1,265	1,087
Amount of allowance for loan losses for loans not deemed to be impaired	1,265	1,087	1,265	1,087
Loans:
Total loans, net	287,099	310,635	287,099	310,635	$ 304,363
Loans not deemed to be impaired	287,099	310,635	287,099	310,635
Unallocated [Member]
Allowance for Loan Losses:
Allowance for loan losses, beginning of period	87	290	57	286
Provision	38	155	68	159
Allowance for loan losses, end of period	125	445	125	445
Amount of allowance for loan losses for loans not deemed to be impaired	$ 125	$ 445	$ 125	$ 445

Allowance for Loan Losses - Loa

Allowance for Loan Losses - Loans by Risk Rating (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Loans by risk rating
Financing Receivable, Net	$ 2,990,133	$ 2,426,119	$ 2,375,661
Construction and Land Development [Member]
Loans by risk rating
Financing Receivable, Net	9,116	8,992	7,824
Commercial and Industrial [Member]
Loans by risk rating
Financing Receivable, Net	1,315,407	812,417	783,950
Municipal [Member]
Loans by risk rating
Financing Receivable, Net	130,047	120,455	121,802
Commercial Real Estate [Member]
Loans by risk rating
Financing Receivable, Net	784,895	786,102	$ 765,385
1-3 (Pass) [Member] | Construction and Land Development [Member]
Loans by risk rating
Financing Receivable, Net	9,116	8,992
1-3 (Pass) [Member] | Commercial and Industrial [Member]
Loans by risk rating
Financing Receivable, Net	1,308,693	807,486
1-3 (Pass) [Member] | Municipal [Member]
Loans by risk rating
Financing Receivable, Net	130,047	120,455
1-3 (Pass) [Member] | Commercial Real Estate [Member]
Loans by risk rating
Financing Receivable, Net	757,953	759,402
4 (Monitor) [Member] | Commercial and Industrial [Member]
Loans by risk rating
Financing Receivable, Net	6,554	4,025
4 (Monitor) [Member] | Commercial Real Estate [Member]
Loans by risk rating
Financing Receivable, Net	24,267	24,354
Impaired [Member] | Commercial and Industrial [Member]
Loans by risk rating
Financing Receivable, Net	160	906
Impaired [Member] | Commercial Real Estate [Member]
Loans by risk rating
Financing Receivable, Net	$ 2,675	$ 2,346

Allowance for Loan Losses - L_2

Allowance for Loan Losses - Loans by Credit Rating (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	$ 1,334,030	$ 1,160,837
Aaa - Aa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	750,227	617,354
A1 - A3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	337,104	341,744
Baa1 - Baa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	241,619	195,844
Ba2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	5,080	5,895
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	881,465	709,688
Commercial and Industrial [Member] | Aaa - Aa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	647,056	523,644
Commercial and Industrial [Member] | A1 - A3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	184,409	186,044
Commercial and Industrial [Member] | Baa1 - Baa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	50,000
Municipal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	128,247	117,655
Municipal [Member] | Aaa - Aa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	64,806	53,273
Municipal [Member] | A1 - A3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	7,228	7,354
Municipal [Member] | Baa1 - Baa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	51,133	51,133
Municipal [Member] | Ba2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	5,080	5,895
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	324,318	333,494
Commercial Real Estate [Member] | Aaa - Aa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	38,365	40,437
Commercial Real Estate [Member] | A1 - A3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	145,467	148,346
Commercial Real Estate [Member] | Baa1 - Baa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivable net of deferred income credit quality	$ 140,486	$ 144,711

Allowance for Loan Losses - Agi

Allowance for Loan Losses - Aging of Past Due Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	$ 6,009	$ 3,251
Non Accrual	1,419	2,014
Accruing Greater Than 90 Days	49
Total Past Due	7,477	5,265
Current Loans	2,982,656	2,420,854
Total loans, net	2,990,133	2,426,119	$ 2,375,661
Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current Loans	9,116	8,992
Total loans, net	9,116	8,992	7,824
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	623	227
Non Accrual	3	400
Total Past Due	626	627
Current Loans	1,314,781	811,790
Total loans, net	1,315,407	812,417	783,950
Municipal [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Current Loans	130,047	120,455
Total loans, net	130,047	120,455	121,802
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	3,596	840
Non Accrual	593	492
Accruing Greater Than 90 Days	49
Total Past Due	4,238	1,332
Current Loans	780,657	784,770
Total loans, net	784,895	786,102	765,385
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	569	1,563
Non Accrual	532	683
Total Past Due	1,101	2,246
Current Loans	442,602	369,651
Total loans, net	443,703	371,897	364,317
Consumer and overdrafts [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	15	18
Non Accrual		4
Total Past Due	15	22
Current Loans	19,851	21,871
Total loans, net	19,866	21,893	21,748
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accruing 30-89 Days Past Due	1,206	603
Non Accrual	291	435
Total Past Due	1,497	1,038
Current Loans	285,602	303,325
Total loans, net	$ 287,099	$ 304,363	$ 310,635

Allowance for Loan Losses - Inf

Allowance for Loan Losses - Information Pertaining to Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	$ 895	$ 254	$ 895	$ 254
With no required reserve recorded, Unpaid Balance Principal	948	500	948	500
With no required reserve recorded, Average Carrying Value Recognized	910	818	771	616
With no required reserve recorded, Interest Income	0	2	2	6
With required reserve recorded, Carrying Value	2,176	2,322	2,176	2,322
With required reserve recorded, Unpaid Balance Principal	2,302	2,442	2,302	2,442
With required reserve recorded, Required Reserve	87	88	87	88
With required reserve recorded, Average Carrying Value Recognized	2,194	2,450	2,235	2,649
With required reserve recorded, Interest Income	22	25	68	73
Carrying Value	3,071	2,576	3,071	2,576
Unpaid Balance Principal	3,250	2,942	3,250	2,942
With required reserve recorded, Required Reserve	87	88	87	88
Average Carrying Value Recognized	3,104	3,268	3,006	3,265
Interest Income	22	27	70	79
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	67	87	67	87
With no required reserve recorded, Unpaid Balance Principal	88	306	88	306
With no required reserve recorded, Required Reserve	12		12
With no required reserve recorded, Average Carrying Value Recognized	73	89	288	87
With no required reserve recorded, Interest Income	0	2	2	6
With required reserve recorded, Carrying Value	93	116	93	116
With required reserve recorded, Unpaid Balance Principal	93	116	93	116
With required reserve recorded, Required Reserve	12	2	12	2
With required reserve recorded, Average Carrying Value Recognized	100	310	95	299
With required reserve recorded, Interest Income	1	2	3	6
Carrying Value	160	203	160	203
Unpaid Balance Principal	181	422	181	422
With required reserve recorded, Required Reserve	12	2	12	2
Average Carrying Value Recognized	173	399	383	386
Interest Income	1	4	5	12
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	592	167	592	167
With no required reserve recorded, Unpaid Balance Principal	624	194	624	194
With no required reserve recorded, Average Carrying Value Recognized	601	729	365	529
With no required reserve recorded, Interest Income		0		0
With required reserve recorded, Carrying Value	2,083	2,206	2,083	2,206
With required reserve recorded, Unpaid Balance Principal	2,209	2,326	2,209	2,326
With required reserve recorded, Required Reserve	75	86	75	86
With required reserve recorded, Average Carrying Value Recognized	2,094	2,140	2,140	2,350
With required reserve recorded, Interest Income	21	23	65	67
Carrying Value	2,675	2,373	2,675	2,373
Unpaid Balance Principal	2,833	2,520	2,833	2,520
With required reserve recorded, Required Reserve	75	86	75	86
Average Carrying Value Recognized	2,695	2,869	2,505	2,879
Interest Income	21	$ 23	65	$ 67
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
With no required reserve recorded, Carrying Value	236		236
With no required reserve recorded, Unpaid Balance Principal	236		236
With no required reserve recorded, Average Carrying Value Recognized	236		118
Carrying Value	$ 236		$ 236

Allowance for Loan Losses - Add

Allowance for Loan Losses - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2020USD ($)Loans	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans receivable	$ 2,990,133,000		$ 2,426,119,000
Allowances for loan losses	$ 33,394,000	$ 32,516,000	$ 29,585,000	$ 29,097,000	$ 29,070,000	$ 28,543,000
Extended Maturity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Description Of Covid Nineteen Loan Modifications Aggregating Deferral Principal	As of September 30, 2020, and as a result of COVID-19 loan modifications, the Company has modifications of 33 loans aggregating $37,987,000, primarily consisting of short-term payment deferrals. Of these modifications, $37,987,000, or 100%, were performing in accordance with their modified terms.
Loans Insured or Guaranteed by US Government Authorities [Member] | US Small Business Administration Payroll Protection Programme [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of loans covered by a sponsored programme | Loans	1,324
Loans receivable	$ 232,000,000
Percentage of loans covered by a sponsored programme guaranteed	100.00%
Allowances for loan losses	$ 0

Reclassifications Out of Accu_3

Reclassifications Out of Accumulated Other Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gains on sales of securities		$ 53	$ 13	$ 61
Provision for income taxes	$ (1,546)	(435)	(3,204)	(584)
Net income	10,887	10,084	30,609	28,967
Salaries and employee benefits	(11,362)	(10,670)	(33,020)	(32,621)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gains on sales of securities		54		61
Provision for income taxes		(15)		(17)
Net income		39		44
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Accretion of Unrealized Losses Transferred [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gains on sales of securities	(196)	(209)	(637)	(779)
Provision for income taxes	51	54	166	205
Net income	(145)	(155)	(471)	(574)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Prior-Service Costs [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	(29)	(29)	(86)	(86)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Actuarial Gains (Losses) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	(472)	(337)	(1,417)	(1,013)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Amortization of Defined Benefit Pension Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before taxes	(501)	(366)	(1,503)	(1,099)
Provision for income taxes	141	103	422	309
Net income	$ (360)	$ (263)	$ (1,081)	$ (790)

Earnings Per Share ("EPS") - Re

Earnings Per Share ("EPS") - Reconciliation of Basic EPS and Diluted EPS (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 10,887	$ 10,084	$ 30,609	$ 28,967
Class A Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 8,630	$ 7,986	$ 24,254	$ 22,853
Weighted average shares outstanding, basic	3,655,469	3,650,449	3,653,429	3,627,076
Basic earnings per share	$ 2.36	$ 2.19	$ 6.64	$ 6.30
Net income	$ 8,630	$ 7,986	$ 24,254	$ 22,853
Weighted average shares outstanding, diluted	5,567,909	5,567,909	5,567,909	5,567,909
Diluted earnings per share	$ 1.96	$ 1.81	$ 5.50	$ 5.20
Class B Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 2,257	$ 2,098	$ 6,355	$ 6,114
Weighted average shares outstanding, basic	1,912,440	1,917,460	1,914,480	1,940,833
Basic earnings per share	$ 1.18	$ 1.09	$ 3.32	$ 3.15
Net income	$ 2,257	$ 2,098	$ 6,355	$ 6,114
Weighted average shares outstanding, diluted	1,912,440	1,917,460	1,914,480	1,940,833
Diluted earnings per share	$ 1.18	$ 1.09	$ 3.32	$ 3.15

Employee Benefits - Additional

Employee Benefits - Additional Information (Detail) - USD ($)	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	$ 1,395,000	$ 1,506,000

Employee Benefits - Components

Employee Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Pension Plan [Member]
Components of net periodic benefit cost
Service cost	$ 344	$ 276	$ 1,032	$ 828
Interest cost	450	473	1,350	1,419
Expected return on plan assets	(952)	(819)	(2,856)	(2,457)
Recognized net losses	261	229	783	687
Net periodic benefit cost (credit)	103	159	309	477
Supplemental Insurance/ Retirement Plan [Member]
Components of net periodic benefit cost
Service cost	353	256	1,059	768
Interest cost	466	482	1,398	1,445
Recognized prior service cost	29	28	87	86
Recognized net losses	211	109	633	326
Net periodic benefit cost (credit)	$ 1,059	$ 875	$ 3,177	$ 2,625

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Specific adjustments to impaired loans recognized	$ 0	$ 9,000		$ 79,000
Amortized cost of Level 3 securities	1,635,000	1,635,000		1,635,000
Liabilities measured at fair value on a recurring or nonrecurring basis	0	0	$ 0
Transfers between level 1, 2 and 3		0		$ 0
Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of loans		49,000	78,000
Fair Value Measurements, Level 3 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized cost of Level 3 securities	48,815,000	48,815,000	23,801,000
Unrealized loss	$ 0	$ 0	$ 0

Fair Value Measurements - Asset

Fair Value Measurements - Assets Measured at Fair Value (Detail) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Unobservable Input	Appraisal adjustments (2)
Securities AFS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Fair Value	$ 48,815	$ 13,301
Valuation Technique	Discounted cash flow	Discounted cash flow
Unobservable Input	Discount rate	Discount rate
Impaired Loans [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Fair Value	$ 828	$ 877
Valuation Technique	Appraisal of collateral (1)	Appraisal of collateral (1)
Unobservable Input		Appraisal adjustments (2)
Impaired Loans, Unobservable Input Value or Range	0
Minimum [Member] | Securities AFS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Securities AFS, Unobservable Input Value or Range	0	1.5
Minimum [Member] | Impaired Loans [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Impaired Loans, Unobservable Input Value or Range		0
Maximum [Member] | Securities AFS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Securities AFS, Unobservable Input Value or Range	1	3.2
Maximum [Member] | Impaired Loans [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Impaired Loans, Unobservable Input Value or Range		30

Fair Value Measurements - Chang

Fair Value Measurements - Changes in Level 3 Securities (Detail) - Obligations Issued by States and Political Subdivisions [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 13,301	$ 88,728
Purchases	53,903	13,290
Maturities/redemptions	(18,357)	(78,196)
Amortization	(32)	(21)
Ending Balance	$ 48,815	$ 23,801

Fair Value Measurements - Finan

Fair Value Measurements - Financial Instruments Measured at Fair Value on a Recurring and Non-recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	$ 291,632	$ 260,502
Fair Value Measurements, Level 1 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments Measured at Fair Value on a Non Recurring Basis Equity Securities		343
Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	242,817	247,201
Financial Instruments Measured at Fair Value on a Non Recurring Basis Equity Securities		1,345
Fair Value Measurements, Level 3 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	48,815	13,301
Financial Instruments Measured at Fair Value on a Non-recurring Basis Impaired Loans	828	877
SBA Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	45,865	54,211
SBA Backed Securities [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	45,865	54,211
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	189,904	184,187
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	189,904	184,187
Privately Issued Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	341	396
Privately Issued Residential Mortgage-Backed Securities [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	341	396
Obligations Issued by States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	48,815	18,076
Obligations Issued by States and Political Subdivisions [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS		4,775
Obligations Issued by States and Political Subdivisions [Member] | Fair Value Measurements, Level 3 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	48,815	13,301
Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	6,707	3,632
Other Debt Securities [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	6,707	3,632
Equity Securities [Member] | Fair Value Measurements, Level 1 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments Measured at Fair Value on a Non Recurring Basis Equity Securities	276
Equity Securities [Member] | Fair Value Measurements, Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments Measured at Fair Value on a Non Recurring Basis Equity Securities	1,369
Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	291,632	260,502
Financial Instruments Measured at Fair Value on a Non Recurring Basis Equity Securities		1,688
Financial Instruments Measured at Fair Value on a Non-recurring Basis Impaired Loans	828	877
Carrying Value [Member] | SBA Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	45,865	54,211
Carrying Value [Member] | U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	189,904	184,187
Carrying Value [Member] | Privately Issued Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	341	396
Carrying Value [Member] | Obligations Issued by States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	48,815	18,076
Carrying Value [Member] | Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	6,707	$ 3,632
Carrying Value [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instruments Measured at Fair Value on a Non Recurring Basis Equity Securities	$ 1,645

Fair Values of Financial Inst_3

Fair Values of Financial Instruments - Carrying Amount and Fair Value of Company's Financial Instruments (Detail) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Financial assets:
Securities held-to-maturity		$ 2,407,176	$ 2,351,120
Loans		2,956,739	2,396,534
Financial liabilities:
Time deposits		581,866	555,447
Other borrowed funds		152,248	370,955
Subordinated debentures		36,083	36,083
Carrying Value [Member]
Financial assets:
Securities held-to-maturity		2,407,176	2,351,120
Loans	[1]	2,956,739	2,396,534
Financial liabilities:
Time deposits		581,866	555,447
Other borrowed funds		152,248	370,955
Subordinated debentures		36,083	36,083
Estimated Fair Value [Member]
Financial assets:
Securities held-to-maturity		2,484,947	2,361,304
Loans	[1]	2,885,187	2,424,770
Financial liabilities:
Time deposits		596,675	560,746
Other borrowed funds		159,690	374,531
Subordinated debentures		36,083	36,083
Fair Value Measurements, Level 2 Inputs [Member]
Financial assets:
Securities held-to-maturity		2,484,947	2,361,304
Financial liabilities:
Time deposits		596,675	560,746
Other borrowed funds		159,690	374,531
Subordinated debentures		36,083	36,083
Fair Value Measurements, Level 3 Inputs [Member]
Financial assets:
Loans	[1]	$ 2,885,187	$ 2,424,770
[1]	Comprised of loans (including collateral dependent impaired loans), net of deferred loan costs and the allowance for loan losses.

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Schedule of Revenue from Contracts (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total net interest income	$ 27,331	$ 23,770	$ 78,350	$ 70,458
Noninterest income:
Service charges on deposit accounts	2,239	2,310	6,558	6,801
Lockbox fees	996	937	2,850	3,018
Net gains on sales of securities		53	13	61
Gains on sales of mortgage loans				154
Other income	934	986	3,112	3,676
Total noninterest income	4,169	4,286	12,520	13,710
ASU 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Total net interest income	27,331	23,770	78,350	70,458
Noninterest income:
Service charges on deposit accounts	2,239	2,310	6,558	6,801
Lockbox fees	996	937	2,850	3,018
Net gains on sales of securities		53		61
Gains on sales of mortgage loans		0		154
Other income	934	986	3,112	3,676
Total noninterest income	4,169	4,286	12,520	13,710
Total revenues	31,500	28,056	90,870	84,168
ASU 2014-09 [Member] | Revenue Guidance Contracts in Scope of Topic 606 [Member]
Noninterest income:
Service charges on deposit accounts	2,239	2,310	6,558	6,801
Lockbox fees	996	937	2,850	3,018
Other income	580	728	1,738	2,338
Total noninterest income	3,815	3,975	11,146	12,157
Total revenues	$ 3,815	$ 3,975	$ 11,146	$ 12,157

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Information about Receivables with Customers (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Other Assets [Member]
Disaggregation of Revenue [Line Items]
Receivables, which are included in "Other assets"	$ 1,362	$ 1,200

Leases - Additional Information

Leases - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2020USD ($)
Operating lease option to extend	options to extend the leases for up to 10 years, and some of which include options to terminate the leases within 1 year.
Sublease Income	$ 30,000
Sublease option to terminate	sublease expires in 2022 with an option to terminate and no option to extend.
Maximum [Member]
Operating lease remaining lease term	32 years
Minimum [Member]
Operating lease remaining lease term	1 year

Leases - Components of lease ex

Leases - Components of lease expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating lease cost	$ 546	$ 550	$ 1,638	$ 1,676
Variable lease cost	135	121	441	405
Total lease cost	$ 681	$ 671	$ 2,079	$ 2,081

Leases - Supplemental cash flow

Leases - Supplemental cash flow information related to leases (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 529	$ 528	$ 1,586	$ 1,605
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 431	$ 433	$ 1,306	$ 1,318

Leases - Supplemental balance s

Leases - Supplemental balance sheet information related to leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Operating Leases:
Operating lease right-of-use assets	$ 14,124	$ 12,521
Operating lease liabilities	$ 14,332	$ 12,690
Weighted Average Remaining Lease Term:
Operating Leases	11 years	11 years
Weighted Average Discount Rate:
Operating Leases	3.10%	3.50%

Leases - Summary of Future Mini

Leases - Summary of Future Minimum Rental Payments (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Year Ending December 31, 2020	$ 397	$ 2,030
2021	2,127	1,754
2022	1,975	1,603
2023	1,920	1,545
2024	1,666	1,277
Thereafter	8,565	7,312
Total lease payments	16,650	15,521
Less imputed interest	(2,318)	(2,831)
Present value of lease liability	$ 14,332	$ 12,690