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Investments - Textual (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) security Loans	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) security Loans	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Schedule of Available-for-sale Securities
Available-for-sale Securities pledged as collateral	$ 262,024,000		$ 262,024,000
Unrealized gain (loss) of available-for sale securities	14,609,000		14,609,000		$ 21,091,000
AOCI available-for-sale securities adjustment tax	4,319,000,000		4,319,000,000		6,235,000
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities	35,000	$ 17,000	$ 11,000	$ 1,241,000
Threshold period of value decline in available-for-sale securities to be considered other than temporary impairment			12 months
Threshold percentage of value decline in available-for-sale securities to be considered other than temporary impairment			10.00%
Threshold amount of value decline in available-for-sale securities to be considered other than temporary impairment			$ 75,000
Other than temporary impairment losses on investment securities			0
Debt securities, amortized cost	$ 1,045,753,000		$ 1,045,753,000
Available-for-sale Securities, Number of Securities, Loss Position | Loans	8		8
U.S. Government agencies
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	1		1
Debt securities, amortized cost	$ 489,000		$ 489,000		651,000
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	129		129
Debt securities, amortized cost	$ 494,425,000		$ 494,425,000		361,734,000
Obligations of states and political subdivisions | Less than 12 months
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	25		25
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	119		119
Debt securities, amortized cost	$ 226,027,000		$ 226,027,000		214,203,000
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations | Less than 12 months
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	14		14
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations | Greater than 12 months
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	9		9
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	63		63
Debt securities, amortized cost	$ 255,324,000		$ 255,324,000		82,413,000
Private label mortgage and asset backed securities | Less than 12 months
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	31		31
Private label mortgage and asset backed securities | Greater than 12 months
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	4		4
Corporate debt securities
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	15		15
Debt securities, amortized cost	$ 59,500,000		$ 59,500,000		$ 30,000,000
U.S. Treasury securities
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	1		1
Debt securities, amortized cost	$ 9,988,000		$ 9,988,000

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