Investment Securities - Held-to-maturity Securities by Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	$ 342
Debt securities, maturing 1 to 5 years, amortized cost	16,429
Debt securities, maturing 5 to 10 years, amortized cost	28,781
Debt securities, maturing over 10 years, amortized cost	339,390
Amortized Cost	384,942
Debt securities, maturing within 1 year, fair value	342
Debt securities, maturing 1 to 5 years, fair value	16,060
Debt securities, maturing 5 to 10 years, fair value	26,650
Debt securities, maturing over 10 years, fair value	304,926
Debt securities, held-to-maturity, fair value	$ 347,978	$ 369,955
Held-to-maturity securities, maturing within 1 year, average yield	2.16%
Held-to-maturity securities, maturing 1 to 5 years, average yield	1.80%
Held-to-maturity securities, maturing 6 to 10 years, average yield	1.87%
Held-to-maturity securities, maturing over 10 years, average yield	2.02%
Held-to-maturity securities, total average yield	2.00%
Debt securities held to maturity, allowance for credit loss	$ 286	286
U.S. government sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	6,537
Debt securities, maturing 5 to 10 years, amortized cost	2,173
Debt securities, maturing over 10 years, amortized cost	29,776
Amortized Cost	38,486
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	6,194
Debt securities, maturing 5 to 10 years, fair value	2,026
Debt securities, maturing over 10 years, fair value	26,061
Debt securities, held-to-maturity, fair value	34,281	35,513
Debt securities held to maturity, allowance for credit loss	0	0
States and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	5,204
Debt securities, maturing 5 to 10 years, amortized cost	6,104
Debt securities, maturing over 10 years, amortized cost	140,195
Amortized Cost	151,503
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	5,158
Debt securities, maturing 5 to 10 years, fair value	5,589
Debt securities, maturing over 10 years, fair value	122,947
Debt securities, held-to-maturity, fair value	133,694	150,138
Debt securities held to maturity, allowance for credit loss	286	286
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	0
Debt securities, maturing 1 to 5 years, amortized cost	1,550
Debt securities, maturing 5 to 10 years, amortized cost	0
Debt securities, maturing over 10 years, amortized cost	114,063
Amortized Cost	115,613
Debt securities, maturing within 1 year, fair value	0
Debt securities, maturing 1 to 5 years, fair value	1,561
Debt securities, maturing 5 to 10 years, fair value	0
Debt securities, maturing over 10 years, fair value	106,638
Debt securities, held-to-maturity, fair value	108,199	110,159
Debt securities held to maturity, allowance for credit loss	0	0
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, maturing within 1 year, amortized cost	342
Debt securities, maturing 1 to 5 years, amortized cost	3,138
Debt securities, maturing 5 to 10 years, amortized cost	20,504
Debt securities, maturing over 10 years, amortized cost	55,356
Amortized Cost	79,340
Debt securities, maturing within 1 year, fair value	342
Debt securities, maturing 1 to 5 years, fair value	3,147
Debt securities, maturing 5 to 10 years, fair value	19,035
Debt securities, maturing over 10 years, fair value	49,280
Debt securities, held-to-maturity, fair value	71,804	74,145
Debt securities held to maturity, allowance for credit loss	$ 0	$ 0

Held-to-maturity Securities, Debt Maturities, Average Yield

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Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity), maturing in sixth through tenth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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-Publisher SEC
-Name Industry Guide
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Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity), maturing after tenth fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing in sixth through tenth rolling fiscal year following current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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