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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) - Loans, Excluding Acquired Loans - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2020
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance |  | $ 90,639
Recorded Investment With No Allowance |  | 33,043
Recorded Investment With Allowance |  | 35,889
Total Recorded Investment |  | 68,932
Related Allowance |  | 5,747
Average Investment in Impaired Loans | $ 48,675 |
Interest Income Recognized | 375 |
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance |  | 1,919
Recorded Investment With No Allowance |  | 1,760
Recorded Investment With Allowance |  | 0
Total Recorded Investment |  | 1,760
Related Allowance |  | 0
Average Investment in Impaired Loans | 2,174 |
Interest Income Recognized | 43 |
Consumer | Credit cards |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance |  | 382
Recorded Investment With No Allowance |  | 382
Recorded Investment With Allowance |  | 0
Total Recorded Investment |  | 382
Related Allowance |  | 0
Average Investment in Impaired Loans | 317 |
Interest Income Recognized | 30 |
Consumer | Other consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance |  | 1,537
Recorded Investment With No Allowance |  | 1,378
Recorded Investment With Allowance |  | 0
Total Recorded Investment |  | 1,378
Related Allowance |  | 0
Average Investment in Impaired Loans | 1,857 |
Interest Income Recognized | 13 |
Real Estate |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance |  | 34,759
Recorded Investment With No Allowance |  | 24,318
Recorded Investment With Allowance |  | 6,775
Total Recorded Investment |  | 31,093
Related Allowance |  | 740
Average Investment in Impaired Loans | 24,615 |
Interest Income Recognized | 176 |
Real Estate | Construction and development |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance |  | 4,648
Recorded Investment With No Allowance |  | 4,466
Recorded Investment With Allowance |  | 72
Total Recorded Investment |  | 4,538
Related Allowance |  | 4
Average Investment in Impaired Loans | 1,920 |
Interest Income Recognized | 14 |
Real Estate | Single family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance |  | 19,466
Recorded Investment With No Allowance |  | 15,139
Recorded Investment With Allowance |  | 2,963
Total Recorded Investment |  | 18,102
Related Allowance |  | 42
Average Investment in Impaired Loans | 13,703 |
Interest Income Recognized | 98 |
Real Estate | Other commercial |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance |  | 10,645
Recorded Investment With No Allowance |  | 4,713
Recorded Investment With Allowance |  | 3,740
Total Recorded Investment |  | 8,453
Related Allowance |  | 694
Average Investment in Impaired Loans | 8,992 |
Interest Income Recognized | 64 |
Commercial |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance |  | 53,961
Recorded Investment With No Allowance |  | 6,965
Recorded Investment With Allowance |  | 29,114
Total Recorded Investment |  | 36,079
Related Allowance |  | 5,007
Average Investment in Impaired Loans | 21,886 |
Interest Income Recognized | 156 |
Commercial | Commercial |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance |  | 53,436
Recorded Investment With No Allowance |  | 6,582
Recorded Investment With Allowance |  | 28,998
Total Recorded Investment |  | 35,580
Related Allowance |  | 5,007
Average Investment in Impaired Loans | 20,739 |
Interest Income Recognized | 148 |
Commercial | Agricultural |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance |  | 525
Recorded Investment With No Allowance |  | 383
Recorded Investment With Allowance |  | 116
Total Recorded Investment |  | 499
Related Allowance |  | $ 0
Average Investment in Impaired Loans | 1,147 |
Interest Income Recognized | $ 8 |

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