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Investment Securities - Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 30,995
Due after one year through five years	38,496
Due after five years through ten years	47,291
Due after ten years	101,413
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	218,195
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	1,183,949
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss, Total	1,402,144	$ 1,460,033
Fair Value
Due in one year or less	30,804
Due after one year through five years	36,522
Due after five years through ten years	44,222
Due after ten years	86,500
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	198,048
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	1,078,502
Fair Value	1,276,550	1,331,443
Amortized Cost
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	83,244
Due after ten years	67,761
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date	151,005
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	603,271
Investment securities held to maturity, at amortized cost, net (fair value of $664,810 and $673,434, respectively)	754,276	766,396
Fair Value
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	68,938
Due after ten years	51,822
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value	120,760
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	544,050
Total investment securities	$ 664,810	$ 673,434

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