Securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Available-for-sale Securities Debt Maturities, Amortized Cost [Abstract]
Available-for-sale Securities, Due in one year or less, Amortized Cost	$ 43,747
Available-for-sale Securities, Due from one to five years, Amortized Cost	65,496
Available-for-sale Securities, Due from five to ten years, Amortized Cost	136,058
Available-for-sale Securities, Due after ten years, Amortized Cost	125,338
Available-for-sale Securities, Amortized Cost	1,281,305	$ 1,183,404
Held-to-maturity Securities Debt Maturities, Amortized Cost [Abstract]
Held-to-maturity Securities, Due in one year or less, Amortized Cost	506
Held-to-maturity Securities, Due from one to five years, Amortized Cost	3,902
Held-to-maturity Securities, Amortized Cost	4,408	4,412
Available-for-sale Securities Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Due in one year or less, Fair Value	44,142
Available-for-sale Securities, Due from one to five years, Fair Value	66,370
Available-for-sale Securities, Due from five to ten years, Fair Value	137,383
Available-for-sale Securities, Due after ten years, Fair Value	122,255
Available-for-sale Securities, Fair Value, Total	1,299,483	1,186,292
Held-to-maturity Securities Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Due in one year or less, Fair Value	508
Held-to-maturity Securities, Due from one to five years, Fair Value	4,008
Held-to-maturity securities, Fair Value, Total	4,516	$ 4,498
Mortgage-Backed Securities
Available-for-sale Securities Debt Maturities, Amortized Cost [Abstract]
Available-for-sale Securities, Not due at single maturity, Amortized Cost	910,666
Available-for-sale Securities Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Not due at single maturity, Fair Value	$ 929,333