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Loans and Allowance for Credit Losses - Summary of Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]                      
Balance at beginning of period       $ 87,576       $ 82,268 $ 87,576 $ 82,268 $ 79,783
Provision for loan losses $ 8,422 $ (1,365) $ 1,263 4,380 $ (4,475) $ 1,723 $ 6,701 5,786 12,700 9,735 49,348
Charge-offs                 (8,045) (6,871) (49,302)
Recoveries                 2,147 2,444 2,439
Balance at end of period 94,378       87,576       94,378 87,576 82,268
Loans ending balance 10,089,117       8,279,778       10,089,117 8,279,778  
Commercial and Industrial                      
Accounts Notes And Loans Receivable [Line Items]                      
Balance at beginning of period       55,919       54,688 55,919 54,688 55,824
Provision for loan losses                 15,708 5,883 43,782
Charge-offs                 (6,709) (5,645) (46,367)
Recoveries                 1,398 993 1,449
Balance at end of period 66,316       55,919       66,316 55,919 54,688
Loans ending balance 6,197,342       5,133,786       6,197,342 5,133,786  
Commercial Real Estate                      
Accounts Notes And Loans Receivable [Line Items]                      
Balance at beginning of period       11,990       10,103 11,990 10,103 8,136
Provision for loan losses                 (1,837) 1,737 1,389
Charge-offs                 (2) (93)  
Recoveries                 301 243 578
Balance at end of period 10,452       11,990       10,452 11,990 10,103
Loans ending balance 1,330,739       1,158,401       1,330,739 1,158,401  
Consumer                      
Accounts Notes And Loans Receivable [Line Items]                      
Balance at beginning of period       14,983       13,265 14,983 13,265 13,450
Provision for loan losses                 (900) 1,746 1,506
Charge-offs                 (716) (929) (2,094)
Recoveries                 336 901 403
Balance at end of period 13,703       14,983       13,703 14,983 13,265
Loans ending balance 2,294,753       1,765,736       2,294,753 1,765,736  
Small Business Lending                      
Accounts Notes And Loans Receivable [Line Items]                      
Balance at beginning of period       $ 4,684       $ 4,212 4,684 4,212 2,373
Provision for loan losses                 (271) 369 2,671
Charge-offs                 (618) (204) (841)
Recoveries                 112 307 9
Balance at end of period 3,907       4,684       3,907 4,684 4,212
Loans ending balance 266,283       221,855       266,283 221,855  
ACI Loans                      
Accounts Notes And Loans Receivable [Line Items]                      
Allowance for credit losses, collectively evaluated for impairment 7,717       8,300       7,717 8,300 10,043
Allowance for credit losses, individually evaluated for impairment 207       224       207 224 235
Loans collectively evaluated for impairment 191,906       241,959       191,906 241,959  
Loans individually evaluated for impairment 11,369       18,601       11,369 18,601  
Loans ending balance 203,275       260,560       203,275 260,560  
ACI Loans | Commercial and Industrial                      
Accounts Notes And Loans Receivable [Line Items]                      
Allowance for credit losses, collectively evaluated for impairment 58       5       58 5 176
Loans collectively evaluated for impairment 13,018       19,486       13,018 19,486  
Loans individually evaluated for impairment 3,789       10,091       3,789 10,091  
Loans ending balance 16,807       29,577       16,807 29,577  
ACI Loans | Commercial Real Estate                      
Accounts Notes And Loans Receivable [Line Items]                      
Allowance for credit losses, collectively evaluated for impairment 1,641       2,006       1,641 2,006 2,652
Allowance for credit losses, individually evaluated for impairment         4         4 3
Loans collectively evaluated for impairment 58,171       71,675       58,171 71,675  
Loans individually evaluated for impairment 7,256       8,186       7,256 8,186  
Loans ending balance 65,427       79,861       65,427 79,861  
ACI Loans | Consumer                      
Accounts Notes And Loans Receivable [Line Items]                      
Allowance for credit losses, collectively evaluated for impairment 6,018       6,289       6,018 6,289 7,215
Allowance for credit losses, individually evaluated for impairment 207       220       207 220 232
Loans collectively evaluated for impairment 120,717       150,798       120,717 150,798  
Loans individually evaluated for impairment 324       324       324 324  
Loans ending balance 121,041       151,122       121,041 151,122  
ANCI Loans                      
Accounts Notes And Loans Receivable [Line Items]                      
Allowance for credit losses, collectively evaluated for impairment 939       1,338       939 1,338 908
Allowance for credit losses, individually evaluated for impairment 113       58       113 58 70
Loans collectively evaluated for impairment 347,515       199,389       347,515 199,389  
Loans individually evaluated for impairment 1,817       1,892       1,817 1,892  
ANCI Loans | Commercial and Industrial                      
Accounts Notes And Loans Receivable [Line Items]                      
Allowance for credit losses, collectively evaluated for impairment 293       864       293 864 299
Loans collectively evaluated for impairment 50,469       58,775       50,469 58,775  
ANCI Loans | Commercial Real Estate                      
Accounts Notes And Loans Receivable [Line Items]                      
Allowance for credit losses, collectively evaluated for impairment 53       130       53 130 243
Loans collectively evaluated for impairment 7,808       15,926       7,808 15,926  
ANCI Loans | Consumer                      
Accounts Notes And Loans Receivable [Line Items]                      
Allowance for credit losses, collectively evaluated for impairment 535       49       535 49 94
Allowance for credit losses, individually evaluated for impairment 6       36       6 36 37
Loans collectively evaluated for impairment 280,776       113,357       280,776 113,357  
Loans individually evaluated for impairment 1,538       1,582       1,538 1,582  
ANCI Loans | Small Business Lending                      
Accounts Notes And Loans Receivable [Line Items]                      
Allowance for credit losses, collectively evaluated for impairment 58       295       58 295 272
Allowance for credit losses, individually evaluated for impairment 107       22       107 22 33
Loans collectively evaluated for impairment 8,462       11,331       8,462 11,331  
Loans individually evaluated for impairment 279       310       279 310  
Originated Loans                      
Accounts Notes And Loans Receivable [Line Items]                      
Allowance for credit losses, collectively evaluated for impairment 78,083       69,192       78,083 69,192 69,407
Allowance for credit losses, individually evaluated for impairment 7,319       8,464       7,319 8,464 1,605
Loans collectively evaluated for impairment 9,459,454       7,746,474       9,459,454 7,746,474  
Loans individually evaluated for impairment 77,056       71,463       77,056 71,463  
Originated Loans | Commercial and Industrial                      
Accounts Notes And Loans Receivable [Line Items]                      
Allowance for credit losses, collectively evaluated for impairment 58,665       46,591       58,665 46,591 52,615
Allowance for credit losses, individually evaluated for impairment 7,300       8,459       7,300 8,459 1,598
Loans collectively evaluated for impairment 6,053,264       4,974,973       6,053,264 4,974,973  
Loans individually evaluated for impairment 76,802       70,461       76,802 70,461  
Originated Loans | Commercial Real Estate                      
Accounts Notes And Loans Receivable [Line Items]                      
Allowance for credit losses, collectively evaluated for impairment 8,758       9,850       8,758 9,850 7,205
Loans collectively evaluated for impairment 1,257,504       1,062,614       1,257,504 1,062,614  
Originated Loans | Consumer                      
Accounts Notes And Loans Receivable [Line Items]                      
Allowance for credit losses, collectively evaluated for impairment 6,918       8,389       6,918 8,389 5,687
Allowance for credit losses, individually evaluated for impairment 19               19    
Loans collectively evaluated for impairment 1,891,144       1,499,260       1,891,144 1,499,260  
Loans individually evaluated for impairment 254       415       254 415  
Originated Loans | Small Business Lending                      
Accounts Notes And Loans Receivable [Line Items]                      
Allowance for credit losses, collectively evaluated for impairment 3,742       4,362       3,742 4,362 3,900
Allowance for credit losses, individually evaluated for impairment         5         5 $ 7
Loans collectively evaluated for impairment $ 257,542       209,627       $ 257,542 209,627  
Loans individually evaluated for impairment         $ 587         $ 587