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Loans Receivable - TDRs Textuals (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
contract
Dec. 31, 2019
USD ($)
contract
Dec. 31, 2018
USD ($)
contract
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Related specific valuation allowance for TDRs   $ 2,143,000  
Interest and fees on loans $ 192,417,000 189,515,000 $ 175,466,000
Commercial business      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Related specific valuation allowance for TDRs   1,944,000  
Commercial business | Commercial and industrial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Related specific valuation allowance for TDRs   1,372,000  
Consumer      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Related specific valuation allowance for TDRs   $ 143,000  
Troubled Debt Restructured Loans      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract 152 65 53
Number of contracts modified that subsequently defaulted | contract 8 17 8
Loans modified during the previous twelve months and subsequently defaulted $ 5,316,000 $ 14,048,000 $ 2,620,000
Interest and fees on loans $ 1,800,000 $ 1,200,000 $ 1,400,000
Troubled Debt Restructured Loans | 90 Days or Greater      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of contracts modified that subsequently defaulted | contract   6 1
Troubled Debt Restructured Loans | Past modified maturity date      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of contracts modified that subsequently defaulted | contract 8 11 7
Troubled Debt Restructured Loans | Commercial business      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract 98 52 38
Number of contracts modified that subsequently defaulted | contract 8 17 6
Loans modified during the previous twelve months and subsequently defaulted $ 5,316,000 $ 14,048,000 $ 1,955,000
Troubled Debt Restructured Loans | Commercial business | Commercial and industrial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract 75 44 31
Number of contracts modified that subsequently defaulted | contract 4 13 5
Loans modified during the previous twelve months and subsequently defaulted $ 2,136,000 $ 12,854,000 $ 1,890,000
Troubled Debt Restructured Loans | Consumer      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Modifications, Number of Contracts | contract 48 12 13
Troubled Debt Restructured Loans | Modified during the quarter      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Related specific valuation allowance for TDRs $ 7,500,000 $ 1,000,000.0 $ 2,300,000
Troubled Debt Restructured Loans | Modified subsequently      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Related specific valuation allowance for TDRs   88,000 $ 260,000
Nonaccrual      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Impaired Financing Receivable, Interest Income, Accrual Method 639,000 595,000  
Interest and fees on loans 0 0  
Nonaccrual | Commercial business      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Impaired Financing Receivable, Interest Income, Accrual Method 590,000 556,000  
Nonaccrual | Commercial business | Commercial and industrial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Impaired Financing Receivable, Interest Income, Accrual Method 434,000 147,000  
Nonaccrual | Consumer      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Impaired Financing Receivable, Interest Income, Accrual Method 47,000 $ 6,000  
Modified subsequently | Troubled Debt Restructured Loans      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Related specific valuation allowance for TDRs $ 229,000