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Loans, Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2020
Analysis of allowance for loan losses by portfolio segment [Roll Forward]        
Balance at beginning of period $ 35,429 [1] $ 26,148 $ 26,148  
Additions (deductions) [Abstract]        
Impact of adoption of ASC 326 [1] 46,755      
Provision for credit losses [1] (474)      
Provision for credit losses [1]   6,721    
Initial allowance on loans purchased with credit deterioration 134      
Recoveries credited to the allowance 548 399    
Loans charged against the allowance (456) (773)    
Balance at end of period   32,495 35,429 [1]  
Balance at end of period [1] 46,755      
ACL: [Abstract]        
Individually evaluated for impairment [1]       $ 5,581
Collectively evaluated for impairment [1]       29,848
Total ending ACL 35,429 [1] 32,495 26,148 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 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 7,401 [1] 7,922 7,922  
Additions (deductions) [Abstract]        
Impact of adoption of ASC 326 9,530      
Provision for credit losses (676)      
Provision for credit losses [1]   2,218    
Initial allowance on loans purchased with credit deterioration 95      
Recoveries credited to the allowance 159 108    
Loans charged against the allowance 0 (36)    
Balance at end of period   10,212 7,401 [1]  
Balance at end of period 9,530      
ACL: [Abstract]        
Individually evaluated for impairment [1]       1,266
Collectively evaluated for impairment [1]       6,135
Total ending ACL 7,401 [1] 10,212 7,922 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 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 6,998 [1] 8,216 8,216  
Additions (deductions) [Abstract]        
Impact of adoption of ASC 326 18,448      
Provision for credit losses (620)      
Provision for credit losses [1]   (508)    
Initial allowance on loans purchased with credit deterioration 18      
Recoveries credited to the allowance 212 117    
Loans charged against the allowance (160) (409)    
Balance at end of period   7,416 6,998 [1]  
Balance at end of period 18,448      
ACL: [Abstract]        
Individually evaluated for impairment [1]       4,124
Collectively evaluated for impairment [1]       2,874
Total ending ACL 6,998 [1] 7,416 8,216 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 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 1,112 [1] 1,283 1,283  
Additions (deductions) [Abstract]        
Impact of adoption of ASC 326 3,979      
Provision for credit losses (87)      
Provision for credit losses [1]   129    
Initial allowance on loans purchased with credit deterioration 21      
Recoveries credited to the allowance 177 174    
Loans charged against the allowance (296) (328)    
Balance at end of period   1,258 1,112 [1]  
Balance at end of period 3,979      
ACL: [Abstract]        
Individually evaluated for impairment [1]       191
Collectively evaluated for impairment [1]       921
Total ending ACL 1,112 [1] 1,258 1,283 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 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 19,918 [1] 8,727 8,727  
Additions (deductions) [Abstract]        
Impact of adoption of ASC 326 14,798      
Provision for credit losses 909      
Provision for credit losses [1]   4,882    
Initial allowance on loans purchased with credit deterioration 0      
Recoveries credited to the allowance 0 0    
Loans charged against the allowance 0 0    
Balance at end of period   13,609 19,918 [1]  
Balance at end of period 14,798      
ACL: [Abstract]        
Individually evaluated for impairment [1]       0
Collectively evaluated for impairment [1]       19,918
Total ending ACL $ 19,918 [1] $ 13,609 8,727 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) (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.