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Allowance for Loan Losses - Summary of Company's Allowance for Loan Losses ("All") and Recorded Investment in Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance $ 35,692 $ 31,264      
Provision (recoupment) for loan losses 1,534 41      
Ending balance 37,055 30,686      
Carrying amount of loan investments     $ 4,246,941 $ 4,092,308 $ 3,702,334
Loans 35,692 31,264 37,055 35,692 30,686
Total Loans     4,246,941 4,092,308 3,702,334
Originated and acquired loans [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 35,461 31,193      
Charge-offs (268) (716)      
Recoveries 97 97      
Provision (recoupment) for loan losses 1,550 0      
Ending balance 36,840 30,574      
Carrying amount of loan investments     4,183,414 4,021,429  
Loans 35,461 31,193 36,840 35,461 30,574
Total Loans     4,183,414 4,021,429  
Originated and acquired loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Ending allowance balance individually evaluated for impairment     1,546   1,218
Ending allowance balance collectively evaluated for impairment     35,294   29,355
Loans individually evaluated for impairment     32,743   34,672
Loans collectively evaluated for impairment     4,150,671   3,555,353
ASC 310-30 [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 231 71      
Provision (recoupment) for loan losses (16) 41      
Ending balance 215 112      
Carrying amount of loan investments     63,527 70,879 112,309
Loans 231 71 215 231 112
Total Loans     63,527 70,879 112,309
ASC 310-30 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Ending balance   113      
Loans   113     113
Commercial Portfolio Segment [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 27,137 21,385      
Ending balance 28,075 21,578      
Carrying amount of loan investments     2,756,144   2,105,899
Loans 27,137 21,385 28,075 27,137 21,578
Total Loans     2,756,144   2,105,899
Commercial Portfolio Segment [Member] | Originated and acquired loans [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 26,946 21,340      
Charge-offs (12) (437)      
Recoveries 27 42      
Provision (recoupment) for loan losses 933 540      
Ending balance 27,894 21,485      
Loans 26,946 21,340 27,894 26,946 21,485
Commercial Portfolio Segment [Member] | Originated and acquired loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Ending allowance balance individually evaluated for impairment     1,471   1,185
Ending allowance balance collectively evaluated for impairment     26,423   20,300
Loans individually evaluated for impairment     18,786   24,175
Loans collectively evaluated for impairment     2,718,219   2,057,022
Commercial Portfolio Segment [Member] | ASC 310-30 [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 191 45      
Provision (recoupment) for loan losses (10) 48      
Ending balance 181 93      
Carrying amount of loan investments     19,139   24,702
Loans 191 45 181 191 93
Total Loans     19,139   24,702
Commercial Portfolio Segment [Member] | ASC 310-30 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Ending balance   93      
Loans   93     93
Residential Portfolio Segment [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 3,800 3,965      
Ending balance 3,718 3,928      
Carrying amount of loan investments     822,652   859,155
Loans 3,800 3,965 3,718 3,800 3,928
Total Loans     822,652   859,155
Residential Portfolio Segment [Member] | Originated and acquired loans [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 3,760 3,965      
Charge-offs (23)        
Recoveries 13 2      
Provision (recoupment) for loan losses (66) (39)      
Ending balance 3,684 3,928      
Loans 3,760 3,965 3,684 3,760 3,928
Residential Portfolio Segment [Member] | Originated and acquired loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Ending allowance balance individually evaluated for impairment     36   31
Ending allowance balance collectively evaluated for impairment     3,648   3,897
Loans individually evaluated for impairment     4,583   8,558
Loans collectively evaluated for impairment     810,561   838,597
Residential Portfolio Segment [Member] | ASC 310-30 [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 40        
Provision (recoupment) for loan losses (6)        
Ending balance 34        
Carrying amount of loan investments     7,508   12,000
Loans 40   34 40  
Total Loans     7,508   12,000
Consumer Loan [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 349 305      
Ending balance 348 290      
Carrying amount of loan investments     22,191   26,565
Loans 349 305 348 349 290
Total Loans     22,191   26,565
Consumer Loan [Member] | Originated and acquired loans [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 349 305      
Charge-offs (233) (279)      
Recoveries 46 53      
Provision (recoupment) for loan losses 186 211      
Ending balance 348 290      
Loans 349 305 348 349 290
Consumer Loan [Member] | Originated and acquired loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Ending allowance balance collectively evaluated for impairment     348   290
Loans individually evaluated for impairment     6,944   38
Loans collectively evaluated for impairment     15,245   26,197
Consumer Loan [Member] | ASC 310-30 [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Carrying amount of loan investments     2   330
Total Loans     2   330
Commercial Real Estate Portfolio Segment [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 4,406 5,609      
Ending balance 4,914 4,890      
Carrying amount of loan investments     645,954   710,715
Loans 4,406 5,609 4,914 4,406 4,890
Total Loans     645,954   710,715
Commercial Real Estate Portfolio Segment [Member] | Originated and acquired loans [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 4,406 5,583      
Recoveries 11        
Provision (recoupment) for loan losses 497 (712)      
Ending balance 4,914 4,871      
Loans $ 4,406 5,583 4,914 $ 4,406 4,871
Commercial Real Estate Portfolio Segment [Member] | Originated and acquired loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Ending allowance balance individually evaluated for impairment     39   2
Ending allowance balance collectively evaluated for impairment     4,875   4,868
Loans individually evaluated for impairment     2,430   1,901
Loans collectively evaluated for impairment     606,646   633,537
Commercial Real Estate Portfolio Segment [Member] | ASC 310-30 [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance   26      
Provision (recoupment) for loan losses   (7)      
Ending balance   19      
Carrying amount of loan investments     36,878   75,277
Loans   26     19
Total Loans     $ 36,878   75,277
Commercial Real Estate Portfolio Segment [Member] | ASC 310-30 [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Ending balance   20      
Loans   $ 20     $ 20