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Description of Business, Basis of Presentation and Significant Accounting Policies and Recently Issued Accounting Pronouncements - Recently Issued Accounting Pronouncements (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Operating lease assets $ 18,000   $ 23,000      
Operating lease liabilities 19,275   24,200      
Allowance for credit losses on loans 70,185 $ 37,993 $ 36,171      
Accumulated Credit Losses to Loans Receivable Ratio   1.01% 0.96%      
Financing Receivable, Purchase, Discount (Premium) CECL Day 1 Balance   $ 4,300        
Financing Receivable, Purchase, Discount (Premium)   10,000 $ 8,400      
Total stockholders’ equity 820,439   809,311   $ 760,723 $ 508,305
AOCI attributable to parent            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total stockholders’ equity 25,018   10,378   (7,455) (1,298)
Retained Earnings [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total stockholders’ equity 224,400   212,474   176,372 149,013
Cumulative Effect, Period of Adoption, Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total stockholders’ equity     (5,615)   (399) 0
Cumulative Effect, Period of Adoption, Adjustment | AOCI attributable to parent            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total stockholders’ equity     0   0 (93)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total stockholders’ equity     $ (5,615)   (399) 93
State and Local Jurisdiction [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Debt Securities, Available-for-sale, Issuance Percent     0.140      
UNITED STATES            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Debt Securities, Available-for-sale, Issuance Percent     0.835      
Total Allowance for Credit Losses [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Impact of CECL Adoption   3,400        
Unused Commitments to Extend Credit [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Impact of CECL Adoption   3,700        
Allowance for credit losses on loans $ 4,681   $ 306   306 170
Unused Commitments to Extend Credit [Member] | Cumulative Effect, Period of Adoption, Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans     $ 3,702   $ 0 $ 0
Purchase Credit Impaired Loans [Member] [Domain]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans   1,600        
Purchase Credit Impaired Loans [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for credit losses on loans   1,600        
ASU 2016-02            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Operating lease assets       $ 29,300    
Operating lease liabilities       $ 30,200    
Accounting Standards Update 2016-13 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Impact of CECL Adoption   5,600        
Allowance for credit losses on loans   1,800        
Financing Receivable, Purchase, Discount (Premium) CECL Day 1 Change   1,600        
Cumulative Effect Of New Accounting Principle In Period Of Adoption PreTax   $ 7,100