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Investment Securities - Securities Temporarily Impaired (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Debt Securities, Available-for-sale [Line Items]      
Fair Value (Estimated) (Less than 12 months) $ 337,576 $ 273,453 $ 298,520
Unrealized Losses (Less than 12 months) (61,255) (6,144) (6,986)
Fair Value (Estimated) (12 months or more) 223,562 55,942 33,511
Unrealized Losses (12 months or more) (67,276) (2,297) (1,469)
Fair Value (Estimated) 561,138 329,395 332,031
Unrealized Losses (128,531) (8,441) (8,455)
U.S. Government-sponsored agencies      
Debt Securities, Available-for-sale [Line Items]      
Fair Value (Estimated) (Less than 12 months) 7,364 24,030 37,054
Unrealized Losses (Less than 12 months) (1,264) (920) (1,396)
Fair Value (Estimated) (12 months or more) 39,452 29,170 16,174
Unrealized Losses (12 months or more) (16,043) (1,375) (871)
Fair Value (Estimated) 46,816 53,200 53,228
Unrealized Losses (17,307) (2,295) (2,267)
   Mortgage-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Fair Value (Estimated) (Less than 12 months) 109,041 216,461 207,951
Unrealized Losses (Less than 12 months) (13,868) (4,768) (4,207)
Fair Value (Estimated) (12 months or more) 162,979 26,772 17,337
Unrealized Losses (12 months or more) (41,957) (922) (598)
Fair Value (Estimated) 272,020 243,233 225,288
Unrealized Losses (55,825) (5,690) (4,805)
   State and political subdivisions      
Debt Securities, Available-for-sale [Line Items]      
Fair Value (Estimated) (Less than 12 months) 197,145 29,528 50,050
Unrealized Losses (Less than 12 months) (44,277) (390) (1,348)
Fair Value (Estimated) (12 months or more) 17,902 0 0
Unrealized Losses (12 months or more) (9,005) 0 0
Fair Value (Estimated) 215,047 29,528 50,050
Unrealized Losses (53,282) (390) (1,348)
Asset-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Fair Value (Estimated) (Less than 12 months) 3,840    
Unrealized Losses (Less than 12 months) (32)    
Fair Value (Estimated) (12 months or more) 0    
Unrealized Losses (12 months or more) 0    
Fair Value (Estimated) 3,840    
Unrealized Losses (32)    
Corporate securities      
Debt Securities, Available-for-sale [Line Items]      
Fair Value (Estimated) (Less than 12 months) 20,186 3,434 3,465
Unrealized Losses (Less than 12 months) (1,814) (66) (35)
Fair Value (Estimated) (12 months or more) 3,229 0 0
Unrealized Losses (12 months or more) (271) 0 0
Fair Value (Estimated) 23,415 3,434 3,465
Unrealized Losses $ (2,085) $ (66) $ (35)