Securities - Schedule of Contractual Maturities of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Available for Sale, Amortized Cost
Within 1 year	$ 2,705
After 1 year through 5 years	125,842
After 5 years through 10 years	228,020
After 10 years	821,864
Amortized Cost	1,178,431	$ 1,169,578
Available for Sale, Estimated Fair Value
Within 1 year	2,682
After 1 year through 5 years	118,742
After 5 years through 10 years	199,276
After 10 years	713,097
Estimated Fair Value	1,033,797	1,057,621
Held to Maturity, Amortized Cost
Within 1 year	0
After 1 year through 5 years	6,603
After 5 years through 10 years	14,634
After 10 years	209,017
Amortized Cost	230,254	242,101
Held to Maturity, Estimated Fair Value
Within 1 year	0
After 1 year through 5 years	3,247
After 5 years through 10 years	13,358
After 10 years	178,560
Estimated Fair Value	$ 195,165	$ 217,609