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Loans and Allowance for Loan Losses - Impaired Loans, Net of Government Guarantees and Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | $ 88,665 |  | $ 88,665 |  | $ 38,071
Recorded Investment With No Allowance | 32,651 |  | 32,651 |  | 28,583
Recorded Investment With Allowance | 37,356 |  | 37,356 |  | 11,187
Total Recorded Investment | 70,007 |  | 70,007 |  | 39,770
Related Allowance | 5,279 |  | 5,279 |  | 684
Average Investment in Impaired Loans | 64,550 | $ 44,309 | 56,612 | $ 44,952 |
Interest Income Recognized | 400 | 400 | 1,200 | 1,100 |
Consumer |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 2,304 |  | 2,304 |  | 2,607
Recorded Investment With No Allowance | 2,155 |  | 2,155 |  | 2,455
Recorded Investment With Allowance | 0 |  | 0 |  | 0
Total Recorded Investment | 2,155 |  | 2,155 |  | 2,455
Related Allowance | 0 |  | 0 |  | 0
Average Investment in Impaired Loans | 2,026 | 3,844 | 2,100 | 4,368 |
Interest Income Recognized | 49 | 63 | 143 | 156 |
Consumer | Credit cards |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 521 |  | 521 |  | 296
Recorded Investment With No Allowance | 521 |  | 521 |  | 296
Recorded Investment With Allowance | 0 |  | 0 |  | 0
Total Recorded Investment | 521 |  | 521 |  | 296
Related Allowance | 0 |  | 0 |  | 0
Average Investment in Impaired Loans | 423 | 283 | 370 | 259 |
Interest Income Recognized | 40 | 35 | 110 | 60 |
Consumer | Other consumer |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 1,783 |  | 1,783 |  | 2,311
Recorded Investment With No Allowance | 1,634 |  | 1,634 |  | 2,159
Recorded Investment With Allowance | 0 |  | 0 |  | 0
Total Recorded Investment | 1,634 |  | 1,634 |  | 2,159
Related Allowance | 0 |  | 0 |  | 0
Average Investment in Impaired Loans | 1,603 | 3,561 | 1,730 | 4,109 |
Interest Income Recognized | 9 | 28 | 33 | 96 |
Real Estate |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 35,066 |  | 35,066 |  | 22,684
Recorded Investment With No Allowance | 19,893 |  | 19,893 |  | 17,694
Recorded Investment With Allowance | 13,310 |  | 13,310 |  | 6,559
Total Recorded Investment | 33,203 |  | 33,203 |  | 24,253
Related Allowance | 659 |  | 659 |  | 247
Average Investment in Impaired Loans | 29,631 | 27,270 | 27,123 | 29,581 |
Interest Income Recognized | 172 | 217 | 526 | 688 |
Real Estate | Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 1,898 |  | 1,898 |  | 1,344
Recorded Investment With No Allowance | 1,708 |  | 1,708 |  | 784
Recorded Investment With Allowance | 97 |  | 97 |  | 485
Total Recorded Investment | 1,805 |  | 1,805 |  | 1,269
Related Allowance | 0 |  | 0 |  | 211
Average Investment in Impaired Loans | 1,972 | 1,411 | 1,946 | 1,747 |
Interest Income Recognized | 10 | 11 | 38 | 41 |
Real Estate | Single family residential |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 17,526 |  | 17,526 |  | 12,906
Recorded Investment With No Allowance | 13,985 |  | 13,985 |  | 11,468
Recorded Investment With Allowance | 2,206 |  | 2,206 |  | 616
Total Recorded Investment | 16,191 |  | 16,191 |  | 12,084
Related Allowance | 31 |  | 31 |  | 36
Average Investment in Impaired Loans | 15,920 | 13,577 | 14,812 | 13,550 |
Interest Income Recognized | 85 | 98 | 287 | 315 |
Real Estate | Other commercial |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 15,642 |  | 15,642 |  | 8,434
Recorded Investment With No Allowance | 4,200 |  | 4,200 |  | 5,442
Recorded Investment With Allowance | 11,007 |  | 11,007 |  | 5,458
Total Recorded Investment | 15,207 |  | 15,207 |  | 10,900
Related Allowance | 628 |  | 628 |  | 0
Average Investment in Impaired Loans | 11,739 | 12,282 | 10,365 | 14,284 |
Interest Income Recognized | 77 | 108 | 201 | 332 |
Commercial |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 51,295 |  | 51,295 |  | 12,780
Recorded Investment With No Allowance | 10,603 |  | 10,603 |  | 8,434
Recorded Investment With Allowance | 24,046 |  | 24,046 |  | 4,628
Total Recorded Investment | 34,649 |  | 34,649 |  | 13,062
Related Allowance | 4,620 |  | 4,620 |  | 437
Average Investment in Impaired Loans | 32,893 | 13,195 | 27,389 | 11,003 |
Interest Income Recognized | 179 | 120 | 531 | 256 |
Commercial | Commercial |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 50,712 |  | 50,712 |  | 10,361
Recorded Investment With No Allowance | 10,153 |  | 10,153 |  | 7,254
Recorded Investment With Allowance | 23,930 |  | 23,930 |  | 4,628
Total Recorded Investment | 34,083 |  | 34,083 |  | 11,882
Related Allowance | 4,620 |  | 4,620 |  | 437
Average Investment in Impaired Loans | 32,020 | 11,840 | 26,379 | 9,533 |
Interest Income Recognized | 176 | 108 | 511 | 222 |
Commercial | Agricultural |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 583 |  | 583 |  | 2,419
Recorded Investment With No Allowance | 450 |  | 450 |  | 1,180
Recorded Investment With Allowance | 116 |  | 116 |  | 0
Total Recorded Investment | 566 |  | 566 |  | 1,180
Related Allowance | 0 |  | 0 |  | $ 0
Average Investment in Impaired Loans | 873 | 1,355 | 1,010 | 1,470 |
Interest Income Recognized | $ 3 | $ 12 | $ 20 | $ 34 |

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