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Securities - Narrative (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) security $ / shares shares | Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($)
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Private mortgage-backed security fair value | $ 1,000,000.0 | $ 1,100,000 |
Other than temporary impairment losses | $ 0 | $ 0 |
Number of securities in an unrealized loss position | security | 69 | 54 |
Investment securities, pledged as collateral for public deposits | $ 630,303,000 | $ 260,826,000 |
Proceeds from sales of securities available for sale | 219,697,000 | 39,797,000 | $ 0
Gains (losses) sales of securities available for sale | 8,024,000 | 97,000 | $ 0
FHLB stock and FRB stock, cost | 23,526,000 | 33,380,000 |
FHLB, cost | 5,855,000 | 15,789,000 |
FRB stock | $ 17,671,000 | $ 17,591,000 |
Visa, Inc | Common Class B |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Stock owned (in shares) | shares | 12,356 |  |
Carrying value of shares | $ 0 |  |
Visa, Inc | Common Class A |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Conversion price (in dollars per share) | $ / shares | $ 1.62 |  |
Conversion of stock (in shares) | shares | 20,051 |  |

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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562 + Details
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