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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses - Details on Allowance for Loan Losses and Recorded Investment by Loan Classification (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 83,575 |  |  |  | $ 67,240 |  |  |  | $ 58,980 | $ 83,575 | $ 67,240 | $ 58,980
Charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | (28,467) | (30,400) | (22,046)
Recovery of previously charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | 12,386 | 12,358 | 6,642
Provision for loan losses | $ 4,644 | $ 8,260 | $ 7,195 | 7,184 | $ 9,319 | $ 8,725 | $ 9,402 | 6,931 | $ 6,281 | $ 6,920 | $ 6,812 | 3,651 | 27,283 | 34,377 | 23,664
Ending Balance | 94,777 |  |  |  | 83,575 |  |  |  | 67,240 |  |  |  | 94,777 | 83,575 | 67,240
Collectively Evaluated for Impairment | 90,512 |  |  |  | 78,934 |  |  |  | 63,147 |  |  |  | 90,512 | 78,934 | 63,147
Individually Evaluated for Impairment | 3,280 |  |  |  | 3,964 |  |  |  | 2,198 |  |  |  | 3,280 | 3,964 | 2,198
Ending Balance | 94,777 |  |  |  | 83,575 |  |  |  | 67,240 |  |  |  | 94,777 | 83,575 | 67,240
Collectively Evaluated for Impairment | 19,708,817 |  |  |  | 17,599,074 |  |  |  | 15,531,482 |  |  |  | 19,708,817 | 17,599,074 | 15,531,482
Individually Evaluated for Impairment | 58,144 |  |  |  | 83,146 |  |  |  | 58,979 |  |  |  | 58,144 | 83,146 | 58,979
Loans acquired with deteriorated credit quality | 20,915 |  |  |  | 25,329 |  |  |  | 42,655 |  |  |  | 20,915 | 25,329 | 42,655
Loans | 19,787,876 |  |  |  | 17,707,549 |  |  |  | 15,633,116 |  |  |  | 19,787,876 | 17,707,549 | 15,633,116
Currently performing impaired loans | 35,800 |  |  |  | 52,500 |  |  |  |  |  |  |  | 35,800 | 52,500 |
Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  |  | 0 |  |  |  | 573 |  |  |  | 0 | 0 | 573
Commercial Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 26,946 |  |  |  | 21,188 |  |  |  | 13,655 | 26,946 | 21,188 | 13,655
Charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | (1,700) | (3,030) | (633)
Recovery of previously charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | 2,232 | 2,096 | 671
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 5,891 | 6,692 | 7,495
Ending Balance | 33,369 |  |  |  | 26,946 |  |  |  | 21,188 |  |  |  | 33,369 | 26,946 | 21,188
Collectively Evaluated for Impairment | 32,134 |  |  |  | 26,222 |  |  |  | 20,753 |  |  |  | 32,134 | 26,222 | 20,753
Individually Evaluated for Impairment | 1,235 |  |  |  | 724 |  |  |  | 95 |  |  |  | 1,235 | 724 | 95
Ending Balance | 33,369 |  |  |  | 26,946 |  |  |  | 21,188 |  |  |  | 33,369 | 26,946 | 21,188
Collectively Evaluated for Impairment | 7,681,608 |  |  |  | 7,124,117 |  |  |  | 6,630,593 |  |  |  | 7,681,608 | 7,124,117 | 6,630,593
Individually Evaluated for Impairment | 18,122 |  |  |  | 28,838 |  |  |  | 18,214 |  |  |  | 18,122 | 28,838 | 18,214
Loans acquired with deteriorated credit quality | 9,488 |  |  |  | 11,999 |  |  |  | 20,803 |  |  |  | 9,488 | 11,999 | 20,803
Loans | 7,709,218 |  |  |  | 7,164,954 |  |  |  | 6,669,610 |  |  |  | 7,709,218 | 7,164,954 | 6,669,610
Commercial Real Estate | Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  |  | 0 |  |  |  | 340 |  |  |  | 0 | 0 | 340
Consumer Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 7,670 |  |  |  | 5,031 |  |  |  | 6,564 | 7,670 | 5,031 | 6,564
Charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | (1,335) | (1,593) | (1,461)
Recovery of previously charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | 1,827 | 2,653 | 1,516
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | (108) | 1,579 | (1,588)
Ending Balance | 8,054 |  |  |  | 7,670 |  |  |  | 5,031 |  |  |  | 8,054 | 7,670 | 5,031
Collectively Evaluated for Impairment | 6,762 |  |  |  | 6,227 |  |  |  | 4,460 |  |  |  | 6,762 | 6,227 | 4,460
Individually Evaluated for Impairment | 1,292 |  |  |  | 1,443 |  |  |  | 410 |  |  |  | 1,292 | 1,443 | 410
Ending Balance | 8,054 |  |  |  | 7,670 |  |  |  | 5,031 |  |  |  | 8,054 | 7,670 | 5,031
Collectively Evaluated for Impairment | 3,036,922 |  |  |  | 2,808,142 |  |  |  | 2,534,996 |  |  |  | 3,036,922 | 2,808,142 | 2,534,996
Individually Evaluated for Impairment | 25,018 |  |  |  | 27,111 |  |  |  | 12,172 |  |  |  | 25,018 | 27,111 | 12,172
Loans acquired with deteriorated credit quality | 6,685 |  |  |  | 9,194 |  |  |  | 14,046 |  |  |  | 6,685 | 9,194 | 14,046
Loans | 3,068,625 |  |  |  | 2,844,447 |  |  |  | 2,561,214 |  |  |  | 3,068,625 | 2,844,447 | 2,561,214
Consumer Real Estate | Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  |  | 0 |  |  |  | 161 |  |  |  | 0 | 0 | 161
Construction and Land Development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 11,128 |  |  |  | 8,962 |  |  |  | 3,624 | 11,128 | 8,962 | 3,624
Charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | (18) | (74) | (137)
Recovery of previously charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | 682 | 1,863 | 1,136
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 870 | 377 | 4,339
Ending Balance | 12,662 |  |  |  | 11,128 |  |  |  | 8,962 |  |  |  | 12,662 | 11,128 | 8,962
Collectively Evaluated for Impairment | 12,629 |  |  |  | 11,100 |  |  |  | 8,879 |  |  |  | 12,629 | 11,100 | 8,879
Individually Evaluated for Impairment | 33 |  |  |  | 28 |  |  |  | 66 |  |  |  | 33 | 28 | 66
Ending Balance | 12,662 |  |  |  | 11,128 |  |  |  | 8,962 |  |  |  | 12,662 | 11,128 | 8,962
Collectively Evaluated for Impairment | 2,426,901 |  |  |  | 2,066,613 |  |  |  | 1,896,553 |  |  |  | 2,426,901 | 2,066,613 | 1,896,553
Individually Evaluated for Impairment | 561 |  |  |  | 2,367 |  |  |  | 5,167 |  |  |  | 561 | 2,367 | 5,167
Loans acquired with deteriorated credit quality | 3,021 |  |  |  | 3,475 |  |  |  | 6,568 |  |  |  | 3,021 | 3,475 | 6,568
Loans | 2,430,483 |  |  |  | 2,072,455 |  |  |  | 1,908,288 |  |  |  | 2,430,483 | 2,072,455 | 1,908,288
Construction and Land Development | Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  |  | 0 |  |  |  | 17 |  |  |  | 0 | 0 | 17
Commercial and Industrial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 31,731 |  |  |  | 24,863 |  |  |  | 24,743 | 31,731 | 24,863 | 24,743
Charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | (19,208) | (13,175) | (4,297)
Recovery of previously charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | 6,473 | 3,035 | 1,317
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 17,116 | 17,008 | 3,100
Ending Balance | 36,112 |  |  |  | 31,731 |  |  |  | 24,863 |  |  |  | 36,112 | 31,731 | 24,863
Collectively Evaluated for Impairment | 35,401 |  |  |  | 30,290 |  |  |  | 23,181 |  |  |  | 35,401 | 30,290 | 23,181
Individually Evaluated for Impairment | 711 |  |  |  | 1,441 |  |  |  | 1,627 |  |  |  | 711 | 1,441 | 1,627
Ending Balance | 36,112 |  |  |  | 31,731 |  |  |  | 24,863 |  |  |  | 36,112 | 31,731 | 24,863
Collectively Evaluated for Impairment | 6,274,280 |  |  |  | 5,246,913 |  |  |  | 4,116,677 |  |  |  | 6,274,280 | 5,246,913 | 4,116,677
Individually Evaluated for Impairment | 14,295 |  |  |  | 23,847 |  |  |  | 23,426 |  |  |  | 14,295 | 23,847 | 23,426
Loans acquired with deteriorated credit quality | 1,721 |  |  |  | 661 |  |  |  | 1,238 |  |  |  | 1,721 | 661 | 1,238
Loans | 6,290,296 |  |  |  | 5,271,421 |  |  |  | 4,141,341 |  |  |  | 6,290,296 | 5,271,421 | 4,141,341
Commercial and Industrial | Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  |  | 0 |  |  |  | 55 |  |  |  | 0 | 0 | 55
Consumer and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 5,423 |  |  |  | 5,874 |  |  |  | 9,520 | 5,423 | 5,874 | 9,520
Charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | (6,206) | (12,528) | (15,518)
Recovery of previously charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | 1,172 | 2,711 | 2,002
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 3,206 | 9,366 | 9,870
Ending Balance | 3,595 |  |  |  | 5,423 |  |  |  | 5,874 |  |  |  | 3,595 | 5,423 | 5,874
Collectively Evaluated for Impairment | 3,586 |  |  |  | 5,095 |  |  |  | 5,874 |  |  |  | 3,586 | 5,095 | 5,874
Individually Evaluated for Impairment | 9 |  |  |  | 328 |  |  |  | 0 |  |  |  | 9 | 328 | 0
Ending Balance | 3,595 |  |  |  | 5,423 |  |  |  | 5,874 |  |  |  | 3,595 | 5,423 | 5,874
Collectively Evaluated for Impairment | 289,106 |  |  |  | 353,289 |  |  |  | 352,663 |  |  |  | 289,106 | 353,289 | 352,663
Individually Evaluated for Impairment | 148 |  |  |  | 983 |  |  |  | 0 |  |  |  | 148 | 983 | 0
Loans acquired with deteriorated credit quality | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Loans | 289,254 |  |  |  | 354,272 |  |  |  | 352,663 |  |  |  | 289,254 | 354,272 | 352,663
Consumer and Other | Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Unallocated Financing Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 677 |  |  |  | $ 1,322 |  |  |  | $ 874 | 677 | 1,322 | 874
Charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0
Recovery of previously charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 308 | (645) | 448
Ending Balance | 985 |  |  |  | 677 |  |  |  | 1,322 |  |  |  | 985 | 677 | 1,322
Ending Balance | $ 985 |  |  |  | $ 677 |  |  |  | $ 1,322 |  |  |  | $ 985 | $ 677 | $ 1,322

X
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