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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Available-for-sale, Less than 12 months, Fair Value $ 438,493 $ 126,177
Available-for-sale, Less than 12 months, Unrealized Losses (10,142) (998)
Available-for-sale, 12 months or longer, Fair Value 129,370 2,377
Available-for-sale, 12 months or longer, Unrealized losses (983) 0
Available-for-sale, Total Fair Value 567,863 128,554
Available-for-sale, Total Unrealized Losses (11,125) (998)
U.S. Treasury Securities and Obligations of U.S. Government Corporations & Agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Available-for-sale, Less than 12 months, Fair Value 144,404 59,211
Available-for-sale, Less than 12 months, Unrealized Losses (3,636) (788)
Available-for-sale, 12 months or longer, Fair Value 0 0
Available-for-sale, 12 months or longer, Unrealized losses 0 0
Available-for-sale, Total Fair Value 144,404 59,211
Available-for-sale, Total Unrealized Losses (3,636) (788)
Obligations of States and Political Subdivisions    
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Available-for-sale, Less than 12 months, Fair Value 51,381 5,380
Available-for-sale, Less than 12 months, Unrealized Losses (1,283) (37)
Available-for-sale, 12 months or longer, Fair Value 0 0
Available-for-sale, 12 months or longer, Unrealized losses 0 0
Available-for-sale, Total Fair Value 51,381 5,380
Available-for-sale, Total Unrealized Losses (1,283) (37)
Mortgage-backed Securities: GSE Residential    
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Available-for-sale, Less than 12 months, Fair Value 230,029 57,609
Available-for-sale, Less than 12 months, Unrealized Losses (5,155) (160)
Available-for-sale, 12 months or longer, Fair Value 129,370 2,377
Available-for-sale, 12 months or longer, Unrealized losses (983) 0
Available-for-sale, Total Fair Value 359,399 59,986
Available-for-sale, Total Unrealized Losses (6,138) (160)
Other Securities    
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Available-for-sale, Less than 12 months, Fair Value 12,679 3,977
Available-for-sale, Less than 12 months, Unrealized Losses (68) (13)
Available-for-sale, 12 months or longer, Fair Value 0 0
Available-for-sale, 12 months or longer, Unrealized losses 0 0
Available-for-sale, Total Fair Value 12,679 3,977
Available-for-sale, Total Unrealized Losses $ (68) $ (13)