Loans - Past Due Financing Receivables (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 |
Financing Receivable, Past Due [Line Items] | | |
Current | $ 4,847,799 | $ 4,775,965 |
Nonaccrual | 22,796 | 26,476 |
Total Financing Receivables | 4,888,139 | 4,825,214 |
Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 10,475 | 19,607 |
Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 6,856 | 2,640 |
Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 213 | 526 |
Construction and land development | | |
Financing Receivable, Past Due [Line Items] | | |
Total Financing Receivables | 379,991 | 443,568 |
Commercial real estate | | |
Financing Receivable, Past Due [Line Items] | | |
Total Financing Receivables | 2,190,285 | 2,132,066 |
Residential real estate | | |
Financing Receivable, Past Due [Line Items] | | |
Total Financing Receivables | 1,400,184 | 1,324,377 |
Commercial and financial | | |
Financing Receivable, Past Due [Line Items] | | |
Total Financing Receivables | 701,747 | 722,322 |
Consumer | | |
Financing Receivable, Past Due [Line Items] | | |
Total Financing Receivables | 215,932 | 202,881 |
Portfolio Loans | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 3,785,014 | 3,557,127 |
Nonaccrual | 15,810 | 15,783 |
Total Financing Receivables | 3,817,358 | 3,588,251 |
Portfolio Loans | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 9,922 | 12,296 |
Portfolio Loans | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 6,399 | 2,609 |
Portfolio Loans | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 213 | 436 |
Portfolio Loans | Construction and land development | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 295,828 | 301,348 |
Nonaccrual | 26 | 28 |
Total Financing Receivables | 300,182 | 301,473 |
Portfolio Loans | Construction and land development | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 97 |
Portfolio Loans | Construction and land development | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 4,328 | 0 |
Portfolio Loans | Construction and land development | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Portfolio Loans | Commercial real estate | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 1,543,584 | 1,427,413 |
Nonaccrual | 5,919 | 6,486 |
Total Financing Receivables | 1,552,024 | 1,437,989 |
Portfolio Loans | Commercial real estate | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 1,098 | 3,852 |
Portfolio Loans | Commercial real estate | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 1,423 | 97 |
Portfolio Loans | Commercial real estate | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 141 |
Portfolio Loans | Residential real estate | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 1,143,397 | 1,044,375 |
Nonaccrual | 7,747 | 7,806 |
Total Financing Receivables | 1,153,951 | 1,055,525 |
Portfolio Loans | Residential real estate | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 2,686 | 2,524 |
Portfolio Loans | Residential real estate | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 121 | 525 |
Portfolio Loans | Residential real estate | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 295 |
Portfolio Loans | Commercial and financial | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 597,048 | 594,930 |
Nonaccrual | 2,032 | 1,280 |
Total Financing Receivables | 605,237 | 603,057 |
Portfolio Loans | Commercial and financial | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 5,764 | 5,186 |
Portfolio Loans | Commercial and financial | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 221 | 1,661 |
Portfolio Loans | Commercial and financial | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 172 | 0 |
Portfolio Loans | Consumer | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 205,157 | 189,061 |
Nonaccrual | 86 | 183 |
Total Financing Receivables | 205,964 | 190,207 |
Portfolio Loans | Consumer | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 374 | 637 |
Portfolio Loans | Consumer | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 306 | 326 |
Portfolio Loans | Consumer | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 41 | 0 |
PULs | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 1,052,112 | 1,209,670 |
Nonaccrual | 4,078 | 7,096 |
Total Financing Receivables | 1,057,200 | 1,222,529 |
PULs | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 553 | 5,642 |
PULs | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 457 | 31 |
PULs | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 90 |
PULs | Construction and land development | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 78,693 | 140,013 |
Nonaccrual | 574 | 0 |
Total Financing Receivables | 79,654 | 141,944 |
PULs | Construction and land development | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 387 | 1,931 |
PULs | Construction and land development | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
PULs | Construction and land development | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
PULs | Commercial real estate | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 625,472 | 680,060 |
Nonaccrual | 1,973 | 1,343 |
Total Financing Receivables | 627,937 | 683,249 |
PULs | Commercial real estate | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 166 | 1,846 |
PULs | Commercial real estate | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 326 | 0 |
PULs | Commercial real estate | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
PULs | Residential real estate | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 242,698 | 260,781 |
Nonaccrual | 936 | 3,740 |
Total Financing Receivables | 243,765 | 266,134 |
PULs | Residential real estate | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 1,523 |
PULs | Residential real estate | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 131 | 0 |
PULs | Residential real estate | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 90 |
PULs | Commercial and financial | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 95,311 | 116,173 |
Nonaccrual | 565 | 2,013 |
Total Financing Receivables | 95,876 | 118,528 |
PULs | Commercial and financial | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 342 |
PULs | Commercial and financial | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
PULs | Commercial and financial | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
PULs | Consumer | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 9,938 | 12,643 |
Nonaccrual | 30 | 0 |
Total Financing Receivables | 9,968 | 12,674 |
PULs | Consumer | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
PULs | Consumer | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 31 |
PULs | Consumer | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Purchased Credit Impaired Loans | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 10,673 | 9,168 |
Nonaccrual | 2,908 | 3,597 |
Total Financing Receivables | 13,581 | 14,434 |
Purchased Credit Impaired Loans | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 1,669 |
Purchased Credit Impaired Loans | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Purchased Credit Impaired Loans | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Purchased Credit Impaired Loans | Construction and land development | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 141 | 135 |
Nonaccrual | 14 | 16 |
Total Financing Receivables | 155 | 151 |
Purchased Credit Impaired Loans | Construction and land development | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Purchased Credit Impaired Loans | Construction and land development | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Purchased Credit Impaired Loans | Construction and land development | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Purchased Credit Impaired Loans | Commercial real estate | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 9,353 | 8,403 |
Nonaccrual | 971 | 1,391 |
Total Financing Receivables | 10,324 | 10,828 |
Purchased Credit Impaired Loans | Commercial real estate | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 1,034 |
Purchased Credit Impaired Loans | Commercial real estate | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Purchased Credit Impaired Loans | Commercial real estate | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Purchased Credit Impaired Loans | Residential real estate | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 562 | 556 |
Nonaccrual | 1,906 | 2,162 |
Total Financing Receivables | 2,468 | 2,718 |
Purchased Credit Impaired Loans | Residential real estate | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Purchased Credit Impaired Loans | Residential real estate | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Purchased Credit Impaired Loans | Residential real estate | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Purchased Credit Impaired Loans | Commercial and financial | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 617 | 74 |
Nonaccrual | 17 | 28 |
Total Financing Receivables | 634 | 737 |
Purchased Credit Impaired Loans | Commercial and financial | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 635 |
Purchased Credit Impaired Loans | Commercial and financial | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Purchased Credit Impaired Loans | Commercial and financial | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Purchased Credit Impaired Loans | Consumer | | |
Financing Receivable, Past Due [Line Items] | | |
Current | 0 | 0 |
Nonaccrual | 0 | 0 |
Total Financing Receivables | 0 | 0 |
Purchased Credit Impaired Loans | Consumer | Accruing 30-59 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Purchased Credit Impaired Loans | Consumer | Accruing 60-89 Days Past Due | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | 0 | 0 |
Purchased Credit Impaired Loans | Consumer | Accruing Greater Than 90 Days | | |
Financing Receivable, Past Due [Line Items] | | |
Financing receivable, recorded investment, past due | $ 0 | $ 0 |