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Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 393,170	$ 273,453	$ 276,415
Unrealized Losses (Less than 12 months)	(51,097)	(6,144)	(5,357)
Fair Value (Estimated) (12 months or more)	161,741	55,942	5,168
Unrealized Losses (12 months or more)	(34,611)	(2,297)	(182)
Fair Value (Estimated)	554,911	329,395	281,583
Unrealized Losses	(85,708)	(8,441)	(5,539)
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	7,996	24,030	53,750
Unrealized Losses (Less than 12 months)	(631)	(920)	(1,745)
Fair Value (Estimated) (12 months or more)	43,782	29,170	0
Unrealized Losses (12 months or more)	(11,713)	(1,375)	0
Fair Value (Estimated)	51,778	53,200	53,750
Unrealized Losses	(12,344)	(2,295)	(1,745)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	173,507	216,461	202,134
Unrealized Losses (Less than 12 months)	(17,645)	(4,768)	(3,403)
Fair Value (Estimated) (12 months or more)	112,781	26,772	5,168
Unrealized Losses (12 months or more)	(20,759)	(922)	(182)
Fair Value (Estimated)	286,288	243,233	207,302
Unrealized Losses	(38,404)	(5,690)	(3,585)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	189,673	29,528	17,053
Unrealized Losses (Less than 12 months)	(32,189)	(390)	(187)
Fair Value (Estimated) (12 months or more)	5,178	0	0
Unrealized Losses (12 months or more)	(2,139)	0	0
Fair Value (Estimated)	194,851	29,528	17,053
Unrealized Losses	(34,328)	(390)	(187)
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	4,038
Unrealized Losses (Less than 12 months)	(88)
Fair Value (Estimated) (12 months or more)	0
Unrealized Losses (12 months or more)	0
Fair Value (Estimated)	4,038
Unrealized Losses	(88)
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	17,956	3,434	3,478
Unrealized Losses (Less than 12 months)	(544)	(66)	(22)
Fair Value (Estimated) (12 months or more)	0	0	0
Unrealized Losses (12 months or more)	0	0	0
Fair Value (Estimated)	17,956	3,434	3,478
Unrealized Losses	$ (544)	$ (66)	$ (22)

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