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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance $ 39,699   $ 39,699   $ 57,334
Recorded Investment With No Allowance 32,656   32,656   30,920
Recorded Investment With Allowance 14,698   14,698   13,003
Total Recorded Investment 47,354   47,354   43,923
Related Allowance 459   459   338
Average Investment in Impaired Loans 44,309 $ 54,468 44,952 $ 52,504  
Interest Income Recognized 400 350 1,100 1,050  
Consumer          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 3,856   3,856   4,925
Recorded Investment With No Allowance 3,645   3,645   4,775
Recorded Investment With Allowance 0   0   0
Total Recorded Investment 3,645   3,645   4,775
Related Allowance 0   0   0
Average Investment in Impaired Loans 3,844 3,597 4,368 3,003  
Interest Income Recognized 63 35 156 76  
Consumer | Credit cards          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 328   328   170
Recorded Investment With No Allowance 328   328   170
Recorded Investment With Allowance 0   0   0
Total Recorded Investment 328   328   170
Related Allowance 0   0   0
Average Investment in Impaired Loans 283 283 259 292  
Interest Income Recognized 35 12 60 23  
Consumer | Other consumer          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 3,528   3,528   4,755
Recorded Investment With No Allowance 3,317   3,317   4,605
Recorded Investment With Allowance 0   0   0
Total Recorded Investment 3,317   3,317   4,605
Related Allowance 0   0   0
Average Investment in Impaired Loans 3,561 3,314 4,109 2,711  
Interest Income Recognized 28 23 96 53  
Real estate          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 20,559   20,559   39,177
Recorded Investment With No Allowance 17,765   17,765   20,804
Recorded Investment With Allowance 8,636   8,636   10,734
Total Recorded Investment 26,401   26,401   31,538
Related Allowance 268   268   338
Average Investment in Impaired Loans 27,270 34,766 29,581 34,913  
Interest Income Recognized 217 223 688 687  
Real estate | Construction          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 879   879   2,522
Recorded Investment With No Allowance 800   800   1,347
Recorded Investment With Allowance 490   490   895
Total Recorded Investment 1,290   1,290   2,242
Related Allowance 232   232   249
Average Investment in Impaired Loans 1,411 2,582 1,747 2,828  
Interest Income Recognized 11 17 41 56  
Real estate | Single family residential          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 11,771   11,771   14,347
Recorded Investment With No Allowance 11,023   11,023   12,725
Recorded Investment With Allowance 715   715   706
Total Recorded Investment 11,738   11,738   13,431
Related Allowance 36   36   53
Average Investment in Impaired Loans 13,577 12,878 13,550 12,772  
Interest Income Recognized 98 85 315 251  
Real estate | Other commercial          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 7,909   7,909   22,308
Recorded Investment With No Allowance 5,942   5,942   6,732
Recorded Investment With Allowance 7,431   7,431   9,133
Total Recorded Investment 13,373   13,373   15,865
Related Allowance 0   0   36
Average Investment in Impaired Loans 12,282 19,306 14,284 19,313  
Interest Income Recognized 108 121 332 380  
Commercial          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 15,284   15,284   13,232
Recorded Investment With No Allowance 11,246   11,246   5,341
Recorded Investment With Allowance 6,062   6,062   2,269
Total Recorded Investment 17,308   17,308   7,610
Related Allowance 191   191   0
Average Investment in Impaired Loans 13,195 16,105 11,003 14,588  
Interest Income Recognized 120 92 256 287  
Commercial | Commercial          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 11,777   11,777   9,954
Recorded Investment With No Allowance 9,786   9,786   4,306
Recorded Investment With Allowance 6,062   6,062   2,269
Total Recorded Investment 15,848   15,848   6,575
Related Allowance 191   191   0
Average Investment in Impaired Loans 11,840 14,543 9,533 12,943  
Interest Income Recognized 108 84 222 255  
Commercial | Agricultural          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 3,507   3,507   3,278
Recorded Investment With No Allowance 1,460   1,460   1,035
Recorded Investment With Allowance 0   0   0
Total Recorded Investment 1,460   1,460   1,035
Related Allowance 0   0   $ 0
Average Investment in Impaired Loans 1,355 1,562 1,470 1,645  
Interest Income Recognized $ 12 $ 8 $ 34 $ 32