Investments - Amortized Cost and Estimated Fair Value - Available-for-Sale Securities (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 924,538,000
Amortized Cost (before ASU 2016-13)		$ 957,459,000
Gross Unrealized Gains	226,000	18,769,000
Gross Unrealized Losses	(60,586,000)	(2,914,000)
Allowance for Credit Losses	0
Allowance for Credit Losses (before ASU 2016-13)		0
Investment securities available for sale	864,178,000
Investment securities available for sale (before ASU 2016-13)		973,314,000
U.S. Government Agencies [Member]
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	1,000,000
Amortized Cost (before ASU 2016-13)		1,546,000
Gross Unrealized Gains		28,000
Gross Unrealized Losses	(19,000)
Investment securities available for sale	981,000
Investment securities available for sale (before ASU 2016-13)		1,574,000
Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	190,417,000
Amortized Cost (before ASU 2016-13)		303,912,000
Gross Unrealized Gains	18,000	4,772,000
Gross Unrealized Losses	(8,989,000)	(1,957,000)
Investment securities available for sale	181,446,000
Investment securities available for sale (before ASU 2016-13)		306,727,000
States and Political Subdivisions [Member]
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	286,650,000
Amortized Cost (before ASU 2016-13)		290,729,000
Gross Unrealized Gains	198,000	13,807,000
Gross Unrealized Losses	(31,960,000)	(268,000)
Investment securities available for sale	254,888,000
Investment securities available for sale (before ASU 2016-13)		304,268,000
Corporate Bond [Member]
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	49,708,000
Amortized Cost (before ASU 2016-13)		28,436,000
Gross Unrealized Gains	10,000	94,000
Gross Unrealized Losses	(3,179,000)	(1,000)
Investment securities available for sale	46,539,000
Investment securities available for sale (before ASU 2016-13)		28,529,000
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	396,763,000
Amortized Cost (before ASU 2016-13)		332,836,000
Gross Unrealized Gains		68,000
Gross Unrealized Losses	(16,439,000)	(688,000)
Investment securities available for sale	$ 380,324,000
Investment securities available for sale (before ASU 2016-13)		$ 332,216,000

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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