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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance $ 53,452   $ 53,452   $ 57,334
Recorded Investment With No Allowance 34,950   34,950   30,920
Recorded Investment With Allowance 6,313   6,313   13,003
Total Recorded Investment 41,263   41,263   43,923
Related Allowance 445   445   338
Average Investment in Impaired Loans 42,593 $ 57,256 44,152 $ 52,736  
Interest Income Recognized 350 376 700 700  
Consumer          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 4,219   4,219   4,925
Recorded Investment With No Allowance 4,042   4,042   4,775
Recorded Investment With Allowance 0   0   0
Total Recorded Investment 4,042   4,042   4,775
Related Allowance 0   0   0
Average Investment in Impaired Loans 4,409 2,842 4,609 2,619  
Interest Income Recognized 43 23 92 42  
Consumer | Credit cards          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 238   238   170
Recorded Investment With No Allowance 238   238   170
Recorded Investment With Allowance 0   0   0
Total Recorded Investment 238   238   170
Related Allowance 0   0   0
Average Investment in Impaired Loans 204 261 236 298  
Interest Income Recognized 10 6 25 11  
Consumer | Other consumer          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 3,981   3,981   4,755
Recorded Investment With No Allowance 3,804   3,804   4,605
Recorded Investment With Allowance 0   0   0
Total Recorded Investment 3,804   3,804   4,605
Related Allowance 0   0   0
Average Investment in Impaired Loans 4,205 2,581 4,373 2,321  
Interest Income Recognized 33 17 67 31  
Real estate          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 36,017   36,017   39,177
Recorded Investment With No Allowance 22,431   22,431   20,804
Recorded Investment With Allowance 5,708   5,708   10,734
Total Recorded Investment 28,139   28,139   31,538
Related Allowance 427   427   338
Average Investment in Impaired Loans 29,838 37,987 30,641 35,325  
Interest Income Recognized 235 249 471 464  
Real estate | Construction          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 1,825   1,825   2,522
Recorded Investment With No Allowance 1,136   1,136   1,347
Recorded Investment With Allowance 396   396   895
Total Recorded Investment 1,532   1,532   2,242
Related Allowance 253   253   249
Average Investment in Impaired Loans 1,887 2,748 1,899 2,969  
Interest Income Recognized 13 21 29 39  
Real estate | Single family residential          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 16,430   16,430   14,347
Recorded Investment With No Allowance 14,919   14,919   12,725
Recorded Investment With Allowance 496   496   706
Total Recorded Investment 15,415   15,415   13,431
Related Allowance 36   36   53
Average Investment in Impaired Loans 14,423 12,837 14,154 12,686  
Interest Income Recognized 118 90 218 167  
Real estate | Other commercial          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 17,762   17,762   22,308
Recorded Investment With No Allowance 6,376   6,376   6,732
Recorded Investment With Allowance 4,816   4,816   9,133
Total Recorded Investment 11,192   11,192   15,865
Related Allowance 138   138   36
Average Investment in Impaired Loans 13,528 22,402 14,588 19,670  
Interest Income Recognized 104 138 224 258  
Commercial          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 13,216   13,216   13,232
Recorded Investment With No Allowance 8,477   8,477   5,341
Recorded Investment With Allowance 605   605   2,269
Total Recorded Investment 9,082   9,082   7,610
Related Allowance 18   18   0
Average Investment in Impaired Loans 8,346 16,427 8,902 14,792  
Interest Income Recognized 72 104 137 194  
Commercial | Commercial          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 9,839   9,839   9,954
Recorded Investment With No Allowance 7,228   7,228   4,306
Recorded Investment With Allowance 605   605   2,269
Total Recorded Investment 7,833   7,833   6,575
Related Allowance 18   18   0
Average Investment in Impaired Loans 7,204 14,275 7,428 12,952  
Interest Income Recognized 61 91 114 170  
Commercial | Agricultural          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 3,377   3,377   3,278
Recorded Investment With No Allowance 1,249   1,249   1,035
Recorded Investment With Allowance 0   0   0
Total Recorded Investment 1,249   1,249   1,035
Related Allowance 0   0   $ 0
Average Investment in Impaired Loans 1,142 2,152 1,474 1,840  
Interest Income Recognized $ 11 $ 13 $ 23 $ 24