Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | Note 3: Effective January 1, 2018, 2016 01, $1,800 $142 At September 30, 2018, $1,734 nine September 30, 2018, $66 An analysis of the amortized cost and fair value by major categories of debt securities available for sale, which are carried at fair value with net unrealized gains (losses) reported on an after-tax basis as a component of cumulative other comprehensive income, and debt securities held to maturity, which are carried at amortized cost, follows: Amortized Gross Gross Fair At September 30, 2018 (In thousands) Debt securities available for sale Securities of U.S. Government sponsored entities $ 167,222 $ - $ (5,478 ) $ 161,744 Agency residential mortgage-backed securities (MBS) 919,381 243 (41,595 ) 878,029 Non-agency residential MBS 122 2 - 124 Agency commercial MBS 1,877 - (30 ) 1,847 Securities of U.S. Government entities 1,223 - (13 ) 1,210 Obligations of states and political subdivisions 182,851 1,841 (4,349 ) 180,343 Corporate securities 1,282,991 411 (27,791 ) 1,255,611 Total debt securities available for sale 2,555,667 2,497 (79,256 ) 2,478,908 Debt securities held to maturity Agency residential MBS 468,354 200 (21,100 ) 447,454 Non-agency residential MBS 3,524 72 - 3,596 Obligations of states and political subdivisions 553,821 2,526 (4,749 ) 551,598 Total debt securities held to maturity 1,025,699 2,798 (25,849 ) 1,002,648 Total $ 3,581,366 $ 5,295 $ (105,105 ) $ 3,481,556 Amortized Gross Gross Fair At December 31, 2017 (In thousands) Debt securities available for sale Securities of U.S. Government sponsored entities $ 122,285 $ 1 $ (2,967 ) $ 119,319 Agency residential MBS 787,679 522 (20,495 ) 767,706 Non-agency residential MBS 153 1 - 154 Agency commercial MBS 2,244 - (25 ) 2,219 Securities of U.S. Government entities 1,612 - (22 ) 1,590 Obligations of states and political subdivisions 182,907 3,796 (1,482 ) 185,221 Corporate securities 1,123,671 1,104 (9,277 ) 1,115,498 Total debt securities available for sale 2,220,551 5,424 (34,268 ) 2,191,707 Debt securities held to maturity Agency residential MBS 545,883 606 (9,850 ) 536,639 Non-agency residential MBS 4,462 70 - 4,532 Agency commercial MBS 9,041 - (66 ) 8,975 Obligations of states and political subdivisions 599,478 7,736 (2,018 ) 605,196 Total debt securities held to maturity 1,158,864 8,412 (11,934 ) 1,155,342 Total $ 3,379,415 $ 13,836 $ (46,202 ) $ 3,347,049 The amortized cost and fair value of debt At September 30, 2018 Debt Securities Available Debt Securities Held Amortized Fair Amortized Fair (In thousands) Maturity in years: 1 year or less $ 128,356 $ 128,080 $ 90,266 $ 90,491 Over 1 to 5 years 1,355,592 1,323,725 220,377 219,016 Over 5 to 10 years 111,553 110,850 242,137 241,023 Over 10 years 38,786 36,253 1,041 1,068 Subtotal 1,634,287 1,598,908 553,821 551,598 MBS 921,380 880,000 471,878 451,050 Total $ 2,555,667 $ 2,478,908 $ 1,025,699 $ 1,002,648 At December 31, 2017 Debt Securities Available Debt Securities Held Amortized Fair Amortized Fair (In thousands) Maturity in years: 1 year or less $ 193,337 $ 193,385 $ 50,295 $ 51,105 Over 1 to 5 years 1,031,807 1,023,047 269,050 269,471 Over 5 to 10 years 159,266 160,042 277,170 281,546 Over 10 years 46,065 45,154 2,963 3,074 Subtotal 1,430,475 1,421,628 599,478 605,196 MBS 790,076 770,079 559,386 550,146 Total $ 2,220,551 $ 2,191,707 $ 1,158,864 $ 1,155,342 Expected maturities of mortgage-related securities can differ from contractual maturities because borrowers have the right to call or prepay obligations with or without call or prepayment penalties. In addition, such factors as prepayments and interest rates may September 30, 2018 December 31, 2017, no An analysis of the gross unrealized losses of the debt securities available for sale portfolio follows: Debt Securities Available for Sale At September 30, 2018 No. of Less than 12 months No. of 12 months or longer No. of Total Investment Unrealized Investment Unrealized Investment Unrealized Positions Fair Value Losses Positions Fair Value Losses Positions Fair Value Losses ($ in thousands) Securities of U.S. Government sponsored entities 5 $ 46,531 $ (461 ) 8 $ 115,213 $ (5,017 ) 13 $ 161,744 $ (5,478 ) Agency residential MBS 23 421,962 (9,816 ) 50 447,104 (31,779 ) 73 869,066 (41,595 ) Agency commercial MBS - - - 1 1,847 (30 ) 1 1,847 (30 ) Securities of U.S. Government entities - - - 2 1,210 (13 ) 2 1,210 (13 ) Obligations of states and political subdivisions 43 32,193 (392 ) 74 67,715 (3,957 ) 117 99,908 (4,349 ) Corporate securities 86 826,287 (16,386 ) 37 333,319 (11,405 ) 123 1,159,606 (27,791 ) Total 157 $ 1,326,973 $ (27,055 ) 172 $ 966,408 $ (52,201 ) 329 $ 2,293,381 $ (79,256 ) An analysis of gross unrecognized losses of the debt securities held to maturity portfolio follows: Debt Securities Held to Maturity At September 30, 2018 No. of Less than 12 months No. of 12 months or longer No. of Total Investment Unrecognized Investment Unrecognized Investment Unrecognized Positions Fair Value Losses Positions Fair Value Losses Positions Fair Value Losses ($ in thousands) Agency residential MBS 26 $ 34,278 $ (952 ) 70 $ 404,842 $ (20,148 ) 96 $ 439,120 $ (21,100 ) Obligations of states and political subdivisions 224 191,579 (1,540 ) 162 164,011 (3,209 ) 386 355,590 (4,749 ) Total 250 $ 225,857 $ (2,492 ) 232 $ 568,853 $ (23,357 ) 482 $ 794,710 $ (25,849 ) The unrealized losses on the Company’s debt securities were caused by market conditions for these types of investments, particularly changes in risk-free interest rates. The Company evaluates debt securities on a quarterly basis including changes in security ratings issued by rating agencies, changes in the financial condition of the issuer, and, for mortgage-backed and asset-backed securities, delinquency and loss information with respect to the underlying collateral, changes in the levels of subordination for the Company’s particular position within the repayment structure and remaining credit enhancement as compared to expected credit losses of the security. Substantially all of these securities continue to be investment grade rated by a major rating agency. One corporate bond with a carrying value of $15.0 $14.1 September 30, 2018, The Company does not not not not September 30, 2018. The fair values of the debt securities could decline in the future if the general economy deteriorates, inflation increases, credit ratings decline, the issuer’s financial condition deteriorates, or the liquidity for debt securities declines. As a result, other than temporary impairments may As of September 30, 2018 December 31, 2017, $740,177 $715,774 An analysis of gross unrealized losses of debt securities available for sale follows: Debt Securities Available for Sale At December 31, 2017 No. of Less than 12 months No. of 12 months or longer No. of Total Investment Unrealized Investment Unrealized Investment Unrealized Positions Fair Value Losses Positions Fair Value Losses Positions Fair Value Losses ($ in thousands) Securities of U.S. Government sponsored entities 1 $ 996 $ (2 ) 8 $ 117,252 $ (2,965 ) 9 $ 118,248 $ (2,967 ) Agency residential MBS 7 238,554 (1,501 ) 51 516,711 (18,994 ) 58 755,265 (20,495 ) Non-agency residential MBS 1 1 - - - - 1 1 - Agency commercial; MBS 2 2,219 (25 ) - - - 2 2,219 (25 ) Securities of U.S. Government entities - - - 3 1,590 (22 ) 3 1,590 (22 ) Obligations of states and political subdivisions 50 21,453 (228 ) 35 52,071 (1,254 ) 85 73,524 (1,482 ) Corporate securities 64 571,112 (4,047 ) 38 282,924 (5,230 ) 102 854,036 (9,277 ) Total 125 $ 834,335 $ (5,803 ) 135 $ 970,548 $ (28,465 ) 260 $ 1,804,883 $ (34,268 ) An analysis of gross unrecognized losses of the debt securities held to maturity portfolio follows: Debt Securities Held to Maturity At December 31, 2017 No. of Less than 12 months No. of 12 months or longer No. of Total Investment Unrecognized Investment Unrecognized Investment Unrecognized Positions Fair Value Losses Positions Fair Value Losses Positions Fair Value Losses ($ in thousands) Agency residential MBS 15 $ 30,218 $ (201 ) 65 $ 479,775 $ (9,649 ) 80 $ 509,993 $ (9,850 ) Agency commercial MBS 1 1,913 (4 ) 1 7,062 (62 ) 2 8,975 (66 ) Obligations of states and political subdivisions 146 131,032 (553 ) 59 58,979 (1,465 ) 205 190,011 (2,018 ) Total 162 $ 163,163 $ (758 ) 125 $ 545,816 $ (11,176 ) 287 $ 708,979 $ (11,934 ) The following table provides information about the amount of interest income earned on investment securities which is fully taxable and which is exempt from regular federal income tax: For the Three Months For the Nine Months Ended September 30, 2018 2017 2018 2017 (In thousands) Taxable $ 16,780 $ 12,957 $ 47,327 $ 37,584 Tax-exempt from regular federal income tax 4,880 5,106 14,768 15,718 Total interest income from investment securities $ 21,660 $ 18,063 $ 62,095 $ 53,302 |