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Allowance for Loan Losses - Schedule of Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance $ 75,701 $ 80,340 $ 76,214 $ 76,817    
Provision charged to operating expense 3,443 2,363 7,528 8,913    
Less loans charged-off (7,460) (3,115) (15,622) (10,858)    
Add back recoveries of loans previously charged-off 2,888 1,647 6,452 6,363    
Ending balance 74,572 81,235 74,572 81,235    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         $ 13,903 $ 13,954
Loans collectively evaluated for impairment         60,669 62,260
Allowance for loan losses 75,701 80,340 76,214 76,817 74,572 76,214
Loans held for investment:            
Individually evaluated for impairment         90,448 104,691
Individually evaluated for impairment         7,411,939 5,312,059
Total loans         7,502,387 5,416,750
Allowance for credit losses due to subsequent impairment         727 427
Real Estate            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 33,498 32,281 28,625 52,296    
Provision charged to operating expense (690) (352) 4,775 (20,492)    
Less loans charged-off (1,695) (379) (2,938) (2,824)    
Add back recoveries of loans previously charged-off 613 221 1,264 2,791    
Ending balance 31,726 31,771 31,726 31,771    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         7,028 4,588
Loans collectively evaluated for impairment         24,698 24,037
Allowance for loan losses 33,498 32,281 28,625 52,296 31,726 28,625
Loans held for investment:            
Individually evaluated for impairment         57,492 68,632
Individually evaluated for impairment         5,063,619 3,445,451
Total loans         5,121,111 3,514,083
Consumer            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 7,554 6,315 7,711 5,144    
Provision charged to operating expense 2,620 2,395 5,157 5,747    
Less loans charged-off (3,115) (2,157) (8,123) (5,761)    
Add back recoveries of loans previously charged-off 962 742 3,276 2,165    
Ending balance 8,021 7,295 8,021 7,295    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         14 0
Loans collectively evaluated for impairment         8,007 7,711
Allowance for loan losses 7,554 6,315 7,711 5,144 8,021 7,711
Loans held for investment:            
Individually evaluated for impairment         25 0
Individually evaluated for impairment         1,038,559 970,266
Total loans         1,038,584 970,266
Commercial            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 33,124 39,995 38,092 18,775    
Provision charged to operating expense 1,530 265 (2,145) 22,268    
Less loans charged-off (2,609) (579) (4,450) (2,085)    
Add back recoveries of loans previously charged-off 1,313 680 1,861 1,403    
Ending balance 33,358 40,361 33,358 40,361    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         6,426 9,254
Loans collectively evaluated for impairment         26,932 28,838
Allowance for loan losses 33,124 39,995 38,092 18,775 33,358 38,092
Loans held for investment:            
Individually evaluated for impairment         31,371 32,397
Individually evaluated for impairment         1,154,836 765,545
Total loans         1,186,207 797,942
Agriculture            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 1,525 1,749 1,786 602    
Provision charged to operating expense (17) 55 (259) 1,390    
Less loans charged-off (41) 0 (111) (188)    
Add back recoveries of loans previously charged-off 0 4 51 4    
Ending balance 1,467 1,808 1,467 1,808    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         435 112
Loans collectively evaluated for impairment         1,032 1,674
Allowance for loan losses 1,525 1,749 1,786 602 1,467 1,786
Loans held for investment:            
Individually evaluated for impairment         1,560 3,662
Individually evaluated for impairment         151,121 129,196
Total loans         152,681 132,858
Other            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 0 0 0 0    
Provision charged to operating expense 0 0 0 0    
Less loans charged-off 0 0 0 0    
Add back recoveries of loans previously charged-off 0 0 0 0    
Ending balance 0 0 0 0    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         0 0
Loans collectively evaluated for impairment         0 0
Allowance for loan losses $ 0 $ 0 $ 0 $ 0 0 0
Loans held for investment:            
Individually evaluated for impairment         0 0
Individually evaluated for impairment         3,804 1,601
Total loans         $ 3,804 $ 1,601