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Securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Available-for-sale Securities Debt Maturities, Amortized Cost [Abstract]
Available-for-sale Securities, Due in one year or less, Amortized Cost	$ 23,201
Available-for-sale Securities, Due from one to five years, Amortized Cost	26,476
Available-for-sale Securities, Due from five to ten years, Amortized Cost	209,435
Available-for-sale Securities, Due after ten years, Amortized Cost	77,163
Available-for-sale Securities, Amortized Cost	1,433,152	$ 1,418,445
Held-to-maturity Securities Debt Maturities, Amortized Cost [Abstract]
Held-to-maturity Securities, Due from one to five years, Amortized Cost	3,887
Held-to-maturity Securities, Amortized Cost	3,887	4,395
Available-for-sale Securities Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Due in one year or less, Fair Value	23,402
Available-for-sale Securities, Due from one to five years, Fair Value	27,466
Available-for-sale Securities, Due from five to ten years, Fair Value	211,691
Available-for-sale Securities, Due after ten years, Fair Value	78,455
Available-for-sale Securities, Fair Value, Total	1,427,605	1,447,230
Held-to-maturity Securities Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Due from one to five years, Fair Value	4,033
Held-to-maturity securities, Fair Value, Total	4,033	$ 4,573
Mortgage-Backed Securities
Available-for-sale Securities Debt Maturities, Amortized Cost [Abstract]
Available-for-sale Securities, Not due at single maturity, Amortized Cost	1,096,877
Available-for-sale Securities Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Not due at single maturity, Fair Value	$ 1,086,591

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