Securities - Unrealized Gains (Losses) of Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Total unrealized gains/(losses) on debt securities available-for-sale, Gross Unrealized Gains	$ 0	$ 261
Total unrealized gains/(losses) on debt securities available-for-sale, Gross Unrealized Losses	(115,428)	(102,582)
Total unrealized gains/(losses) on debt securities available-for-sale, Net Unrealized Gains/(Losses)	(115,428)	(102,321)
Income tax (expense) benefit, Gross Unrealized Gains	0	(56)
Income tax (expense) benefit, Gross Unrealized Losses	24,567	21,915
Income tax (expense) benefit, Net Unrealized Gains/(Losses)	24,567	21,859
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss), Gross Unrealized Gains	0	205
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss), Gross Unrealized Losses	(90,861)	(80,667)
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss), Net Unrealized Gains/(Losses)	$ (90,861)	$ (80,462)