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Allowance for Loan and Lease Losses - Allowance for Originated and Acquired Loan and Lease Losses by Portfolio Segment (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
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       $ 39,771         $ 39,771    
Provision for loan and lease losses $ 2,058 $ 272 $ 1,045 567 $ 2,014 $ 402 $ 976 $ 769 3,942 $ 4,161 $ 4,321
Ending Balance 43,410       39,771       43,410 39,771  
Originated Loans and Leases                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       39,686       35,598 39,686 35,598  
Charge-offs                 (2,127) (1,856)  
Recoveries                 1,865 1,716  
Provision for loan and lease losses                 3,897 4,228  
Ending Balance 43,321       39,686       43,321 39,686 35,598
Acquired Loans and Leases                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       85       157 85 157  
Charge-offs                 (313) (718)  
Recoveries                 272 713  
Provision for loan and lease losses                 45 (67)  
Ending Balance 89       85       89 85 157
Commercial and industrial | Originated Loans and Leases                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       11,812       9,389 11,812 9,389  
Charge-offs                 (293) (291)  
Recoveries                 50 119  
Provision for loan and lease losses                 (352) 2,595  
Ending Balance 11,217       11,812       11,217 11,812 9,389
Commercial and industrial | Acquired Loans and Leases                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       25       0 25 0  
Charge-offs                 (41) (74)  
Recoveries                 106 24  
Provision for loan and lease losses                 (35) 75  
Ending Balance 55       25       55 25 0
Commercial real estate | Originated Loans and Leases                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       20,412       19,836 20,412 19,836  
Charge-offs                 (60) (21)  
Recoveries                 812 980  
Provision for loan and lease losses                 2,319 (383)  
Ending Balance 23,483       20,412       23,483 20,412 19,836
Commercial real estate | Acquired Loans and Leases                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       0       97 0 97  
Charge-offs                 (82) (159)  
Recoveries                 31 637  
Provision for loan and lease losses                 51 (575)  
Ending Balance 0       0       0 0 97
Residential real estate | Originated Loans and Leases                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       6,161       5,149 6,161 5,149  
Charge-offs                 (424) (584)  
Recoveries                 324 212  
Provision for loan and lease losses                 1,256 1,384  
Ending Balance 7,317       6,161       7,317 6,161 5,149
Residential real estate | Acquired Loans and Leases                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       54       54 54 54  
Charge-offs                 (190) (483)  
Recoveries                 135 44  
Provision for loan and lease losses                 29 439  
Ending Balance 28       54       28 54 54
Consumer and other | Originated Loans and Leases                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       1,301       1,224 1,301 1,224  
Charge-offs                 (1,350) (960)  
Recoveries                 679 405  
Provision for loan and lease losses                 674 632  
Ending Balance 1,304       1,301       1,304 1,301 1,224
Consumer and other | Acquired Loans and Leases                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       6       6 6 6  
Charge-offs                 0 (2)  
Recoveries                 0 8  
Provision for loan and lease losses                 0 (6)  
Ending Balance 6       6       6 6 6
Finance Leases | Originated Loans and Leases                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       0       0 0 0  
Charge-offs                 0 0  
Recoveries                 0 0  
Provision for loan and lease losses                 0 0  
Ending Balance 0       0       0 0 0
Finance Leases | Acquired Loans and Leases                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       $ 0       $ 0 0 0  
Charge-offs                 0 0  
Recoveries                 0 0  
Provision for loan and lease losses                 0 0  
Ending Balance $ 0       $ 0       $ 0 $ 0 $ 0