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Investment Securities - Schedule of Gross Unrealized Losses and Fair Value by Length of Time that the Individual Available-For-Sale Securities Have Been in a Continuous Unrealized Loss (Details) $ in Thousands	Jun. 30, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Number of securities | security	254	260
Less than 12 months, estimated fair value	$ 495,037	$ 495,164
Less than 12 months, unrealized losses	(54,665)	(58,439)
12 months or greater, estimated fair value	1,036,537	1,093,919
12 months or greater, unrealized losses	(142,453)	(146,839)
Estimated fair value	1,531,574	1,589,083
Unrealized losses	$ (197,118)	$ (205,278)
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security	234	232
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value	$ 23,778	$ 23,881
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss	(3,112)	(3,228)
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value	899,535	932,753
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss	(130,766)	(122,205)
Debt securities, held-to-maturity, unrealized loss position, fair value	923,313	956,634
Gross Unrecognized Losses	$ (133,878)	$ (125,433)
U.S. treasury bonds
Debt Securities, Available-for-sale [Line Items]
Number of securities | security	2	2
Less than 12 months, estimated fair value	$ 0	$ 0
Less than 12 months, unrealized losses	0	0
12 months or greater, estimated fair value	46,629	46,327
12 months or greater, unrealized losses	(3,214)	(3,466)
Estimated fair value	46,629	46,327
Unrealized losses	$ (3,214)	$ (3,466)
U. S. agency securities
Debt Securities, Available-for-sale [Line Items]
Number of securities | security	79	85
Less than 12 months, estimated fair value	$ 495,037	$ 490,699
Less than 12 months, unrealized losses	(54,665)	(58,437)
12 months or greater, estimated fair value	166,750	179,029
12 months or greater, unrealized losses	(19,505)	(19,612)
Estimated fair value	661,787	669,728
Unrealized losses	$ (74,170)	$ (78,049)
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Number of securities | security	158	157
Less than 12 months, estimated fair value	$ 0	$ 3,994
Less than 12 months, unrealized losses	0	0
12 months or greater, estimated fair value	764,204	808,697
12 months or greater, unrealized losses	(112,852)	(117,072)
Estimated fair value	764,204	812,691
Unrealized losses	$ (112,852)	$ (117,072)
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security	143	143
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value	$ 0	$ 0
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss	0	0
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value	615,772	652,667
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss	(89,484)	(88,390)
Debt securities, held-to-maturity, unrealized loss position, fair value	615,772	652,667
Gross Unrecognized Losses	$ (89,484)	$ (88,390)
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Number of securities | security	13	14
Less than 12 months, estimated fair value	$ 0	$ 471
Less than 12 months, unrealized losses	0	(2)
12 months or greater, estimated fair value	48,969	49,742
12 months or greater, unrealized losses	(6,013)	(5,856)
Estimated fair value	48,969	50,213
Unrealized losses	$ (6,013)	$ (5,858)
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security	16	16
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value	$ 0	$ 0
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss	0	0
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value	78,358	80,564
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss	(13,480)	(11,993)
Debt securities, held-to-maturity, unrealized loss position, fair value	78,358	80,564
Gross Unrecognized Losses	$ (13,480)	$ (11,993)
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Number of securities | security	1	1
Less than 12 months, estimated fair value	$ 0	$ 0
Less than 12 months, unrealized losses	0	0
12 months or greater, estimated fair value	8,312	8,299
12 months or greater, unrealized losses	(559)	(658)
Estimated fair value	8,312	8,299
Unrealized losses	$ (559)	$ (658)
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security	43	43
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value	$ 2,890	$ 3,110
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss	(16)	(45)
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value	114,230	113,071
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss	(10,689)	(12,047)
Debt securities, held-to-maturity, unrealized loss position, fair value	117,120	116,181
Gross Unrecognized Losses	$ (10,705)	$ (12,092)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Number of securities | security	1	1
Less than 12 months, estimated fair value	$ 0	$ 0
Less than 12 months, unrealized losses	0	0
12 months or greater, estimated fair value	1,673	1,825
12 months or greater, unrealized losses	(310)	(175)
Estimated fair value	1,673	1,825
Unrealized losses	$ (310)	$ (175)
Held-to-maturity, securities in unrealized loss positions, qualitative disclosure, number of positions | security	32	30
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, fair value	$ 20,888	$ 20,771
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss	(3,096)	(3,183)
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, fair value	91,175	86,451
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss	(17,113)	(9,775)
Debt securities, held-to-maturity, unrealized loss position, fair value	112,063	107,222
Gross Unrecognized Losses	$ (20,209)	$ (12,958)

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