Investment Securities - Schedule of Available-for-Sale Securities and Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,763,371	$ 1,803,898
Gross Unrealized Gains	76	63
Gross Unrealized Losses	(181,231)	(205,278)
Allowance for credit losses	(31)	(17)
Estimated Fair Value		1,598,666
HTM, Amortized Cost	1,077,311	1,094,140
Gross Unrealized Gains	0	0
Gross Unrealized Losses	111,525	125,433
HTM estimated fair value	965,786	968,707
HTM Allowance for credit losses	(2,008)	(766)
Investment securities held-to-maturity, net of allowance for credit losses of $2,008 and $766, respectively, (fair value of $965,786 and $968,707, respectively)	1,075,303	1,093,374
Schedule of Held-to-maturity Securities [Line Items]
HTM, Amortized Cost	1,077,311	1,094,140
Gross Unrealized Gains	0	0
Gross unrealized losses	(111,525)	(125,433)
HTM estimated fair value	965,786	968,707
Investment securities available for sale, amortized cost	1,763,371	1,803,898
Gross Unrealized Gains	76	63
Gross Unrealized Losses	181,231	205,278
Allowance for credit losses	31	17
Investment securities available-for-sale:		1,598,666
U.S. treasury bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	49,818	49,793
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,887)	(3,466)
Allowance for credit losses	0	0
Estimated Fair Value	46,931	46,327
Schedule of Held-to-maturity Securities [Line Items]
Investment securities available for sale, amortized cost	49,818	49,793
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2,887	3,466
Allowance for credit losses	0	0
Investment securities available-for-sale:	46,931	46,327
U. S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	741,694	747,777
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(67,227)	(78,049)
Allowance for credit losses	0	0
Estimated Fair Value	674,467	669,728
Schedule of Held-to-maturity Securities [Line Items]
Investment securities available for sale, amortized cost	741,694	747,777
Gross Unrealized Gains	0	0
Gross Unrealized Losses	67,227	78,049
Allowance for credit losses	0	0
Investment securities available-for-sale:	674,467	669,728
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	905,524	937,557
Gross Unrealized Gains	76	18
Gross Unrealized Losses	(105,358)	(117,072)
Allowance for credit losses	0	0
Estimated Fair Value	800,242	820,503
HTM, Amortized Cost	724,756	741,057
Gross Unrealized Gains	0	0
Gross Unrealized Losses	77,286	88,390
HTM estimated fair value	647,470	652,667
Schedule of Held-to-maturity Securities [Line Items]
HTM, Amortized Cost	724,756	741,057
Gross Unrealized Gains	0	0
Gross unrealized losses	(77,286)	(88,390)
HTM estimated fair value	647,470	652,667
Investment securities available for sale, amortized cost	905,524	937,557
Gross Unrealized Gains	76	18
Gross Unrealized Losses	105,358	117,072
Allowance for credit losses	0	0
Investment securities available-for-sale:	800,242	820,503
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	55,421	56,071
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(5,139)	(5,858)
Allowance for credit losses	0	0
Estimated Fair Value	50,282	50,213
HTM, Amortized Cost	92,141	92,557
Gross Unrealized Gains	0	0
Gross Unrealized Losses	11,234	11,993
HTM estimated fair value	80,907	80,564
Schedule of Held-to-maturity Securities [Line Items]
HTM, Amortized Cost	92,141	92,557
Gross Unrealized Gains	0	0
Gross unrealized losses	(11,234)	(11,993)
HTM estimated fair value	80,907	80,564
Investment securities available for sale, amortized cost	55,421	56,071
Gross Unrealized Gains	0	0
Gross Unrealized Losses	5,139	5,858
Allowance for credit losses	0	0
Investment securities available-for-sale:	50,282	50,213
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,914	10,700
Gross Unrealized Gains	0	45
Gross Unrealized Losses	(432)	(658)
Allowance for credit losses	0	0
Estimated Fair Value	8,482	10,087
HTM, Amortized Cost	128,160	128,273
Gross Unrealized Gains	0	0
Gross Unrealized Losses	8,690	12,092
HTM estimated fair value	119,470	116,181
HTM Allowance for credit losses	16
Schedule of Held-to-maturity Securities [Line Items]
HTM, Amortized Cost	128,160	128,273
Gross Unrealized Gains	0	0
Gross unrealized losses	(8,690)	(12,092)
HTM estimated fair value	119,470	116,181
Investment securities available for sale, amortized cost	8,914	10,700
Gross Unrealized Gains	0	45
Gross Unrealized Losses	432	658
Allowance for credit losses	0	0
Investment securities available-for-sale:	8,482	10,087
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,000	2,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(188)	(175)
Allowance for credit losses	(31)	(17)
Estimated Fair Value	1,781	1,808
HTM, Amortized Cost	132,254	132,253
Gross Unrealized Gains	0	0
Gross Unrealized Losses	14,315	12,958
HTM estimated fair value	117,939	119,295
HTM Allowance for credit losses	2,000
Schedule of Held-to-maturity Securities [Line Items]
HTM, Amortized Cost	132,254	132,253
Gross Unrealized Gains	0	0
Gross unrealized losses	(14,315)	(12,958)
HTM estimated fair value	117,939	119,295
Investment securities available for sale, amortized cost	2,000	2,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	188	175
Allowance for credit losses	31	17
Investment securities available-for-sale:	1,781	$ 1,808
Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,763,371
Estimated Fair Value	1,582,185
Schedule of Held-to-maturity Securities [Line Items]
Investment securities available for sale, amortized cost	1,763,371
Investment securities available-for-sale:	$ 1,582,185