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Investment Securities - Securities Temporarily Impaired (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Debt Securities, Available-for-sale [Line Items]      
Fair Value (Estimated) (Less than 12 months) $ 339,083 $ 273,453 $ 264,229
Unrealized Losses (Less than 12 months) (30,283) (6,144) (9,830)
Fair Value (Estimated) (12 months or more) 163,006 55,942 3,744
Unrealized Losses (12 months or more) (21,224) (2,297) (130)
Fair Value (Estimated) 502,089 329,395 267,973
Unrealized Losses (51,507) (8,441) (9,960)
U.S. Government-sponsored agencies      
Debt Securities, Available-for-sale [Line Items]      
Fair Value (Estimated) (Less than 12 months) 8,266 24,030 51,894
Unrealized Losses (Less than 12 months) (358) (920) (3,601)
Fair Value (Estimated) (12 months or more) 47,647 29,170 0
Unrealized Losses (12 months or more) (7,848) (1,375) 0
Fair Value (Estimated) 55,913 53,200 51,894
Unrealized Losses (8,206) (2,295) (3,601)
   Mortgage-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Fair Value (Estimated) (Less than 12 months) 174,021 216,461 180,138
Unrealized Losses (Less than 12 months) (11,708) (4,768) (5,335)
Fair Value (Estimated) (12 months or more) 111,954 26,772 3,744
Unrealized Losses (12 months or more) (12,347) (922) (130)
Fair Value (Estimated) 285,975 243,233 183,882
Unrealized Losses (24,055) (5,690) (5,465)
   State and political subdivisions      
Debt Securities, Available-for-sale [Line Items]      
Fair Value (Estimated) (Less than 12 months) 141,305 29,528 28,783
Unrealized Losses (Less than 12 months) (17,850) (390) (808)
Fair Value (Estimated) (12 months or more) 3,405 0 0
Unrealized Losses (12 months or more) (1,029) 0 0
Fair Value (Estimated) 144,710 29,528 28,783
Unrealized Losses (18,879) (390) (808)
Asset-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Fair Value (Estimated) (Less than 12 months) 4,340    
Unrealized Losses (Less than 12 months) (18)    
Fair Value (Estimated) (12 months or more) 0    
Unrealized Losses (12 months or more) 0    
Fair Value (Estimated) 4,340    
Unrealized Losses (18)    
Corporate securities      
Debt Securities, Available-for-sale [Line Items]      
Fair Value (Estimated) (Less than 12 months) 11,151 3,434 3,414
Unrealized Losses (Less than 12 months) (349) (66) (86)
Fair Value (Estimated) (12 months or more) 0 0 0
Unrealized Losses (12 months or more) 0 0 0
Fair Value (Estimated) 11,151 3,434 3,414
Unrealized Losses $ (349) $ (66) $ (86)