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Loans Receivable - TDRs Textuals (Details) | 12 Months Ended
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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 |  |

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- Definition The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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