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Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Allowance for Loan and Lease Losses and Corresponding Loan and Lease Balances (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for loan and lease losses                            
Beginning balance       $ 10,923       $ 7,632 $ 10,923 $ 7,632 $ 4,794      
Provisions $ 3,347 $ 3,900 $ 3,515 1,891 $ 5,004 $ 1,683 $ 1,152 2,513 12,653 10,352 6,966      
Charge-offs                 (8,196) (7,817) (4,359)      
Recoveries                 1,326 756 231      
Ending balance 16,706       10,923       16,706 10,923 7,632      
Ending balance:                            
Individually evaluated for impairment                       $ 3,965 $ 1,017 $ 2,326
Collectively evaluated for impairment                       8,867 8,295 2,016
Allowance for loan and lease losses 16,706     10,923 10,923     7,632 16,706 10,923 7,632 16,706 10,923 7,632
Loans and leases ending balance:                            
Individually evaluated for impairment                       31,111 11,926 8,908
Collectively evaluated for impairment                       1,918,691 1,732,048 849,618
Total loans and leases                       2,277,492 2,148,011 1,345,437
Receivables Acquired with Deteriorated Credit Quality                            
Ending balance:                            
Loans acquired with deteriorated credit quality                       3,874 1,611 3,290
Loans and leases ending balance:                            
Loans acquired with deteriorated credit quality                       327,690 404,037 486,911
Commercial Real Estate                            
Allowance for loan and lease losses                            
Beginning balance       1,945       2,280 1,945 2,280 1,112      
Provisions                 4,343 4,032 2,464      
Charge-offs                 (1,494) (4,367) (1,296)      
Ending balance 4,794       1,945       4,794 1,945 2,280      
Ending balance:                            
Individually evaluated for impairment                       1,101   1,076
Collectively evaluated for impairment                       1,765 1,456 470
Allowance for loan and lease losses 4,794     1,945 1,945     2,280 1,945 1,945 2,280 4,794 1,945 2,280
Loans and leases ending balance:                            
Individually evaluated for impairment                       13,884 8,916 4,160
Collectively evaluated for impairment                       711,097 580,125 285,571
Total loans and leases                       891,693 796,344 533,695
Commercial Real Estate | Receivables Acquired with Deteriorated Credit Quality                            
Ending balance:                            
Loans acquired with deteriorated credit quality                       1,928 489 734
Loans and leases ending balance:                            
Loans acquired with deteriorated credit quality                       166,712 207,303 243,964
Residential Real Estate                            
Allowance for loan and lease losses                            
Beginning balance       2,483       2,981 2,483 2,981 1,936      
Provisions                 (405) 135 1,873      
Charge-offs                 (440) (633) (828)      
Ending balance 1,638       2,483       1,638 2,483 2,981      
Ending balance:                            
Individually evaluated for impairment                       158 293 615
Collectively evaluated for impairment                       1,047 1,743 476
Allowance for loan and lease losses 1,638     2,483 2,483     2,981 2,483 2,483 2,981 1,638 2,483 2,981
Loans and leases ending balance:                            
Individually evaluated for impairment                       2,429 1,300 4,042
Collectively evaluated for impairment                       430,227 433,721 256,555
Total loans and leases                       577,218 610,738 484,335
Residential Real Estate | Receivables Acquired with Deteriorated Credit Quality                            
Ending balance:                            
Loans acquired with deteriorated credit quality                       433 447 1,890
Loans and leases ending balance:                            
Loans acquired with deteriorated credit quality                       144,562 175,717 223,738
Construction, Land Development, and Other Land                            
Allowance for loan and lease losses                            
Beginning balance       742       232 742 232 834      
Provisions                 (520) 605 (585)      
Charge-offs                   (95) (17)      
Ending balance 222       742       222 742 232      
Ending balance:                            
Individually evaluated for impairment                           137
Collectively evaluated for impairment                       145 742 95
Allowance for loan and lease losses 222     742 742     232 742 742 232 222 742 232
Loans and leases ending balance:                            
Individually evaluated for impairment                           208
Collectively evaluated for impairment                       99,483 133,787 31,390
Total loans and leases                       105,429 140,766 40,232
Construction, Land Development, and Other Land | Receivables Acquired with Deteriorated Credit Quality                            
Ending balance:                            
Loans acquired with deteriorated credit quality                       77    
Loans and leases ending balance:                            
Loans acquired with deteriorated credit quality                       5,946 6,979 8,634
Commercial and Industrial                            
Allowance for loan and lease losses                            
Beginning balance       4,196       1,403 4,196 1,403 648      
Provisions                 6,058 2,869 782      
Charge-offs                 (2,836) (76) (30)      
Recoveries                     3      
Ending balance 7,418       4,196       7,418 4,196 1,403      
Ending balance:                            
Individually evaluated for impairment                       2,692 396 171
Collectively evaluated for impairment                       3,308 3,126 596
Allowance for loan and lease losses 7,418     4,196 4,196     1,403 4,196 4,196 1,403 7,418 4,196 1,403
Loans and leases ending balance:                            
Individually evaluated for impairment                       14,784 1,382 171
Collectively evaluated for impairment                       496,446 423,392 155,955
Total loans and leases                       521,238 438,238 165,696
Commercial and Industrial | Receivables Acquired with Deteriorated Credit Quality                            
Ending balance:                            
Loans acquired with deteriorated credit quality                       1,418 674 636
Loans and leases ending balance:                            
Loans acquired with deteriorated credit quality                       10,008 13,464 9,570
Installment and Other                            
Allowance for loan and lease losses                            
Beginning balance       334       357 334 357 121      
Provisions                 34 (11) 237      
Charge-offs                 (327) (12) (1)      
Ending balance 41       334       41 334 357      
Ending balance:                            
Individually evaluated for impairment                       14 328 327
Collectively evaluated for impairment                       9 5  
Allowance for loan and lease losses 41     334 334     357 334 334 357 41 334 357
Loans and leases ending balance:                            
Individually evaluated for impairment                       14 328 327
Collectively evaluated for impairment                       3,752 2,057 594
Total loans and leases                       4,228 2,959 1,926
Installment and Other | Receivables Acquired with Deteriorated Credit Quality                            
Ending balance:                            
Loans acquired with deteriorated credit quality                       18 1 30
Loans and leases ending balance:                            
Loans acquired with deteriorated credit quality                       462 574 1,005
Lease Financing Receivables                            
Allowance for loan and lease losses                            
Beginning balance       1,223       379 1,223 379 143      
Provisions                 3,143 2,722 2,195      
Charge-offs                 (3,099) (2,634) (2,187)      
Recoveries                 1,326 756 228      
Ending balance 2,593       1,223       2,593 1,223 379      
Ending balance:                            
Collectively evaluated for impairment                       2,593 1,223 379
Allowance for loan and lease losses $ 2,593     $ 1,223 $ 1,223     $ 379 $ 1,223 $ 1,223 $ 379 2,593 1,223 379
Loans and leases ending balance:                            
Collectively evaluated for impairment                       177,686 158,966 119,553
Total loans and leases                       $ 177,686 $ 158,966 $ 119,553