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Investment Securities Available-for-Sale - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |
Federal Reserve and Federal Home Loan Bank stock | $ 40,104 | $ 35,194 |
Debt securities as percentage of total investment securities | 99.90% |  |
Debt securities weighted average duration | 3 years 2 months 12 days |  |
Debt securities, available-for-sale, realized gain | $ 1,900 | 1,700 | $ 391
Debt securities, available-for-sale, realized loss | 46 | 153 | 294
Proceeds from sale/call of available-for-sale securities | $ 124,144 | $ 104,785 | $ 36,292
Holdings of securities of any one issuer | 10.00% | 10.00% |
Corporate and Municipal Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Allowance for credit loss, expense | $ 167 |  |
Collateral Pledged |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale securities pledged as collateral | $ 268,400 |  |

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- Definition Period of time between issuance and maturity of debt securities, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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