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Investments - Textual (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) security Loans	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Schedule of Available-for-sale Securities
Available-for-sale Securities pledged as collateral	$ 177,938,000
Unrealized gain (loss) of available-for sale securities	7,470,000		$ 21,091,000
AOCI available-for-sale securities adjustment tax	$ 2,208,000		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		$ 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	$ 761,249,000
Available-for-sale Securities, Number of Securities, Loss Position | Loans	4
U.S. Government agencies
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	1
Debt securities, amortized cost	$ 644,000		651,000
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	114
Debt securities, amortized cost	$ 408,188,000		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	43
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	114
Debt securities, amortized cost	$ 212,364,000		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	4
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	15
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	36
Debt securities, amortized cost	$ 108,053,000		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	13
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	1
Corporate debt securities
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	10
Debt securities, amortized cost	$ 32,000,000		$ 30,000,000

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