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Loans and Allowance for Credit Losses - Summary of Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]      
Balance at beginning of period $ 94,378 $ 87,576  
Provision for loan losses 11,210 4,380  
Charge-offs (938) (812)  
Recoveries 388 393  
Balance at end of period 105,038 91,537  
Loans ending balance 13,710,243 8,677,400 $ 10,089,117
Commercial and Industrial      
Accounts Notes And Loans Receivable [Line Items]      
Balance at beginning of period 66,316 55,919  
Provision for loan losses 9,299 5,330  
Charge-offs (461) (58)  
Recoveries 372 18  
Balance at end of period 75,526 61,209  
Loans ending balance 7,481,688 5,500,775 6,197,342
Commercial Real Estate      
Accounts Notes And Loans Receivable [Line Items]      
Balance at beginning of period 10,452 11,990  
Provision for loan losses 102 (513)  
Charge-offs (85)    
Recoveries   209  
Balance at end of period 10,469 11,686  
Loans ending balance 2,830,195 1,156,410 1,330,739
Consumer      
Accounts Notes And Loans Receivable [Line Items]      
Balance at beginning of period 13,703 14,983  
Provision for loan losses 1,206 (903)  
Charge-offs (234) (301)  
Recoveries 15 103  
Balance at end of period 14,690 13,882  
Loans ending balance 2,639,518 1,784,878 2,294,753
Small Business Lending      
Accounts Notes And Loans Receivable [Line Items]      
Balance at beginning of period 3,907 4,684  
Provision for loan losses 603 466  
Charge-offs (158) (453)  
Recoveries 1 63  
Balance at end of period 4,353 4,760  
Loans ending balance 758,842 235,337 266,283
ACI Loans      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, collectively evaluated for impairment 7,482 82,596  
Allowance for credit losses, individually evaluated for impairment 52 8,941  
Loans collectively evaluated for impairment 292,845 8,599,852  
Loans individually evaluated for impairment 10,938 77,548  
Loans ending balance 303,783   203,275
ACI Loans | Commercial and Industrial      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, collectively evaluated for impairment 89 52,535  
Allowance for credit losses, individually evaluated for impairment   8,674  
Loans collectively evaluated for impairment 39,301 5,433,850  
Loans individually evaluated for impairment 3,668 66,925  
Loans ending balance 42,969   16,807
ACI Loans | Commercial Real Estate      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, collectively evaluated for impairment 1,410 11,684  
Allowance for credit losses, individually evaluated for impairment 7 2  
Loans collectively evaluated for impairment 102,074 1,148,486  
Loans individually evaluated for impairment 6,946 7,924  
Loans ending balance 109,020   65,427
ACI Loans | Consumer      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, collectively evaluated for impairment 5,983 13,639  
Allowance for credit losses, individually evaluated for impairment 45 243  
Loans collectively evaluated for impairment 131,133 1,782,604  
Loans individually evaluated for impairment 324 2,274  
Loans ending balance 131,457   $ 121,041
ACI Loans | Small Business Lending      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, collectively evaluated for impairment   4,738  
Allowance for credit losses, individually evaluated for impairment   22  
Loans collectively evaluated for impairment 20,337 234,912  
Loans individually evaluated for impairment   $ 425  
Loans ending balance 20,337    
ANCI Loans      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, collectively evaluated for impairment 1,051    
Allowance for credit losses, individually evaluated for impairment 66    
Loans collectively evaluated for impairment 3,552,046    
Loans individually evaluated for impairment 1,780    
ANCI Loans | Commercial and Industrial      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, collectively evaluated for impairment 301    
Loans collectively evaluated for impairment 1,105,684    
ANCI Loans | Commercial Real Estate      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, collectively evaluated for impairment 77    
Loans collectively evaluated for impairment 1,471,679    
ANCI Loans | Consumer      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, collectively evaluated for impairment 557    
Allowance for credit losses, individually evaluated for impairment 7    
Loans collectively evaluated for impairment 509,600    
Loans individually evaluated for impairment 1,524    
ANCI Loans | Small Business Lending      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, collectively evaluated for impairment 116    
Allowance for credit losses, individually evaluated for impairment 59    
Loans collectively evaluated for impairment 465,083    
Loans individually evaluated for impairment 256    
Originated Loans      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, collectively evaluated for impairment 81,868    
Allowance for credit losses, individually evaluated for impairment 14,519    
Loans collectively evaluated for impairment 9,763,413    
Loans individually evaluated for impairment 89,221    
Originated Loans | Commercial and Industrial      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, collectively evaluated for impairment 60,630    
Allowance for credit losses, individually evaluated for impairment 14,506    
Loans collectively evaluated for impairment 6,244,068    
Loans individually evaluated for impairment 88,967    
Originated Loans | Commercial Real Estate      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, collectively evaluated for impairment 8,975    
Loans collectively evaluated for impairment 1,249,496    
Originated Loans | Consumer      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, collectively evaluated for impairment 8,085    
Allowance for credit losses, individually evaluated for impairment 13    
Loans collectively evaluated for impairment 1,996,683    
Loans individually evaluated for impairment 254    
Originated Loans | Small Business Lending      
Accounts Notes And Loans Receivable [Line Items]      
Allowance for credit losses, collectively evaluated for impairment 4,178    
Loans collectively evaluated for impairment $ 273,166