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Loans, Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Analysis of allowance for loan losses by portfolio segment [Roll Forward]            
Balance at beginning of period $ 45,926 $ 34,500 $ 35,429 [1]      
Additions (deductions) [Abstract]            
Impact of adoption of ASC 326 46,799 [1]   46,799 [1]     $ 26,148
Provision for credit losses [1] (659)   (2,558)      
Provision for credit losses [1]   975   $ 12,884    
Initial allowance on loans purchased with credit deterioration     134      
Recoveries credited to the allowance 2,484 650 3,918 2,404    
Loans charged against the allowance (952) (354) (1,698) (5,665)    
Balance at end of period   35,771   35,771 $ 35,429 [1]  
Balance at end of period [1] 46,799   46,799      
ACL [Abstract]            
Individually evaluated for impairment [1]         5,581  
Collectively evaluated for impairment [1]         29,848  
Total ending ACL   35,771   35,771 35,429 [1]  
Loans [Abstract]            
Individually evaluated for impairment [1]         50,672  
Collectively evaluated for impairment [1]         2,690,880  
Total recorded investment [1]         2,742,577  
Accrued interest included in recorded investment [1]         8,899  
Total loans [1]         2,733,678  
ASU 2016-13 [Member]            
Additions (deductions) [Abstract]            
Initial allowance on loans purchased with credit deterioration         130  
Impact of Adoption [Member] | ASU 2016-13 [Member]            
Additions (deductions) [Abstract]            
Impact of adoption of ASC 326         11,574  
Balance at end of period         11,574  
Loans Acquired with Deteriorated Credit Quality [Member]            
ACL [Abstract]            
Loans acquired with deteriorated credit quality [1]         0  
Loans [Abstract]            
Loans acquired with deteriorated credit quality [1]         1,025  
Commercial [Member]            
Analysis of allowance for loan losses by portfolio segment [Roll Forward]            
Balance at beginning of period 9,094 8,731 7,401 [1]      
Additions (deductions) [Abstract]            
Impact of adoption of ASC 326 9,876   9,876     7,922
Provision for credit losses (969)   (2,591)      
Provision for credit losses [1]   (875)   2,804    
Initial allowance on loans purchased with credit deterioration     95      
Recoveries credited to the allowance 1,751 297 2,420 1,463    
Loans charged against the allowance 0 0 0 (4,036)    
Balance at end of period   8,153   8,153 7,401 [1]  
Balance at end of period 9,876   9,876      
ACL [Abstract]            
Individually evaluated for impairment [1]         1,266  
Collectively evaluated for impairment [1]         6,135  
Total ending ACL   8,153   8,153 7,401 [1]  
Loans [Abstract]            
Individually evaluated for impairment [1]         9,431  
Collectively evaluated for impairment [1]         1,236,052  
Total recorded investment [1]         1,245,951  
Accrued interest included in recorded investment [1]         3,536  
Total loans [1]         1,242,415  
Commercial [Member] | Impact of Adoption [Member] | ASU 2016-13 [Member]            
Additions (deductions) [Abstract]            
Impact of adoption of ASC 326         2,551  
Balance at end of period         2,551  
Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]            
ACL [Abstract]            
Loans acquired with deteriorated credit quality [1]         0  
Loans [Abstract]            
Loans acquired with deteriorated credit quality [1]         468  
Mortgage [Member]            
Analysis of allowance for loan losses by portfolio segment [Roll Forward]            
Balance at beginning of period 18,933 7,261 6,998 [1]      
Additions (deductions) [Abstract]            
Impact of adoption of ASC 326 19,175   19,175     8,216
Provision for credit losses 16   (264)      
Provision for credit losses [1]   (257)   (895)    
Initial allowance on loans purchased with credit deterioration     18      
Recoveries credited to the allowance 339 157 720 364    
Loans charged against the allowance (113) (162) (297) (686)    
Balance at end of period   6,999   6,999 6,998 [1]  
Balance at end of period 19,175   19,175      
ACL [Abstract]            
Individually evaluated for impairment [1]         4,124  
Collectively evaluated for impairment [1]         2,874  
Total ending ACL   6,999   6,999 6,998 [1]  
Loans [Abstract]            
Individually evaluated for impairment [1]         39,245  
Collectively evaluated for impairment [1]         980,449  
Total recorded investment [1]         1,020,104  
Accrued interest included in recorded investment [1]         4,178  
Total loans [1]         1,015,926  
Mortgage [Member] | Impact of Adoption [Member] | ASU 2016-13 [Member]            
Additions (deductions) [Abstract]            
Impact of adoption of ASC 326         12,000  
Balance at end of period         12,000  
Mortgage [Member] | Loans Acquired with Deteriorated Credit Quality [Member]            
ACL [Abstract]            
Loans acquired with deteriorated credit quality [1]         0  
Loans [Abstract]            
Loans acquired with deteriorated credit quality [1]         410  
Installment [Member]            
Analysis of allowance for loan losses by portfolio segment [Roll Forward]            
Balance at beginning of period 3,701 1,217 1,112 [1]      
Additions (deductions) [Abstract]            
Impact of adoption of ASC 326 4,061   4,061     1,283
Provision for credit losses 805   499      
Provision for credit losses [1]   18   322    
Initial allowance on loans purchased with credit deterioration     21      
Recoveries credited to the allowance 394 196 778 577    
Loans charged against the allowance (839) (192) (1,401) (943)    
Balance at end of period   1,239   1,239 1,112 [1]  
Balance at end of period 4,061   4,061      
ACL [Abstract]            
Individually evaluated for impairment [1]         191  
Collectively evaluated for impairment [1]         921  
Total ending ACL   1,239   1,239 1,112 [1]  
Loans [Abstract]            
Individually evaluated for impairment [1]         1,996  
Collectively evaluated for impairment [1]         474,379  
Total recorded investment [1]         476,522  
Accrued interest included in recorded investment [1]         1,185  
Total loans [1]         475,337  
Installment [Member] | Impact of Adoption [Member] | ASU 2016-13 [Member]            
Additions (deductions) [Abstract]            
Impact of adoption of ASC 326         3,052  
Balance at end of period         3,052  
Installment [Member] | Loans Acquired with Deteriorated Credit Quality [Member]            
ACL [Abstract]            
Loans acquired with deteriorated credit quality [1]         0  
Loans [Abstract]            
Loans acquired with deteriorated credit quality [1]         147  
Subjective Allocation [Member]            
Analysis of allowance for loan losses by portfolio segment [Roll Forward]            
Balance at beginning of period 14,198 17,291 19,918 [1]      
Additions (deductions) [Abstract]            
Impact of adoption of ASC 326 13,687   13,687     $ 8,727
Provision for credit losses (511)   (202)      
Provision for credit losses [1]   2,089   10,653    
Initial allowance on loans purchased with credit deterioration     0      
Recoveries credited to the allowance 0 0 0 0    
Loans charged against the allowance 0 0 0 0    
Balance at end of period   19,380   19,380 19,918 [1]  
Balance at end of period $ 13,687   $ 13,687      
ACL [Abstract]            
Individually evaluated for impairment [1]         0  
Collectively evaluated for impairment [1]         19,918  
Total ending ACL   $ 19,380   $ 19,380 19,918 [1]  
Subjective Allocation [Member] | Impact of Adoption [Member] | ASU 2016-13 [Member]            
Additions (deductions) [Abstract]            
Impact of adoption of ASC 326         (6,029)  
Balance at end of period         (6,029)  
Subjective Allocation [Member] | Loans Acquired with Deteriorated Credit Quality [Member]            
ACL [Abstract]            
Loans acquired with deteriorated credit quality [1]         $ 0  
[1] Beginning January 1, 2021, calculation is based on CECL methodology. Prior to January 1, 2021, calculation was based on the probable incurred loss methodology.