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Investment Securities - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months $ 60,224 $ 359,313
Greater than or equal to 12 continuous months 704,750 459,948
Total securities in a loss position 764,974 819,261
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (2,678) (23,733)
Greater than or equal to 12 continuous months (149,474) (103,305)
Held-to-maturity, gross unrealized losses (152,152) (127,038)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 1,196 354,695
Available-for-sale, greater than 12 continuous months, fair value 657,206 443,274
Available-for-sale, total securities in a loss position, fair value 658,402 797,969
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss (36) (33,887)
Available-for-sale, greater than 12 continuous months, unrealized loss (96,189) (56,656)
Available-for-sale, total securities in a loss position, unrealized loss (96,225) (90,543)
Marketable Securities, Fair Value    
Marketable securities, less than 12 continuous months, fair value 61,420 714,008
Marketable securities, greater than 12 continuous months, fair value 1,361,956 903,222
Marketable securities, total securities in a loss position, fair value 1,423,376 1,617,230
Marketable Securities, Continuous Unrealized Loss    
Marketable securities, less than 12 continuous months, unrealized loss (2,714) (57,620)
Marketable securities, greater than 12 continuous months, unrealized loss (245,663) (159,961)
Marketable securities, total securities in a loss position, unrealized loss (248,377) (217,581)
MBS pass-through securities issued by FHLMC, FNMA and GNMA    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 0 62,627
Greater than or equal to 12 continuous months 249,726 218,507
Total securities in a loss position 249,726 281,134
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0 (5,960)
Greater than or equal to 12 continuous months (61,870) (44,187)
Held-to-maturity, gross unrealized losses (61,870) (50,147)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 44,630
Available-for-sale, greater than 12 continuous months, fair value 70,980 52,235
Available-for-sale, total securities in a loss position, fair value 70,980 96,865
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 (4,501)
Available-for-sale, greater than 12 continuous months, unrealized loss (13,263) (7,632)
Available-for-sale, total securities in a loss position, unrealized loss (13,263) (12,133)
CMOs issued by FHLMC    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 4,311 78,144
Greater than or equal to 12 continuous months 181,530 113,796
Total securities in a loss position 185,841 191,940
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (68) (5,874)
Greater than or equal to 12 continuous months (33,380) (23,629)
Held-to-maturity, gross unrealized losses (33,448) (29,503)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 169,760
Available-for-sale, greater than 12 continuous months, fair value 269,883 143,995
Available-for-sale, total securities in a loss position, fair value 269,883 313,755
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 (15,144)
Available-for-sale, greater than 12 continuous months, unrealized loss (37,236) (18,538)
Available-for-sale, total securities in a loss position, unrealized loss (37,236) (33,682)
CMOs issued by FNMA    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 41,398 106,485
Greater than or equal to 12 continuous months 53,508 0
Total securities in a loss position 94,906 106,485
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (2,413) (5,419)
Greater than or equal to 12 continuous months (6,712) 0
Held-to-maturity, gross unrealized losses (9,125) (5,419)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 4,790
Available-for-sale, greater than 12 continuous months, fair value 26,820 27,529
Available-for-sale, total securities in a loss position, fair value 26,820 32,319
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 (235)
Available-for-sale, greater than 12 continuous months, unrealized loss (4,012) (3,617)
Available-for-sale, total securities in a loss position, unrealized loss (4,012) (3,852)
CMOs issued by GNMA    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 11,481 27,570
Greater than or equal to 12 continuous months 25,859 10,331
Total securities in a loss position 37,340 37,901
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (154) (1,676)
Greater than or equal to 12 continuous months (4,662) (1,400)
Held-to-maturity, gross unrealized losses (4,816) (3,076)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 8,214
Available-for-sale, greater than 12 continuous months, fair value 16,837 23,612
Available-for-sale, total securities in a loss position, fair value 16,837 31,826
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 (374)
Available-for-sale, greater than 12 continuous months, unrealized loss (3,668) (2,922)
Available-for-sale, total securities in a loss position, unrealized loss (3,668) (3,296)
SBA-backed securities    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 0 2,239
Greater than or equal to 12 continuous months 1,713 0
Total securities in a loss position 1,713 2,239
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0 (133)
Greater than or equal to 12 continuous months (140) 0
Held-to-maturity, gross unrealized losses (140) (133)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 37,845
Available-for-sale, greater than 12 continuous months, fair value 28,223 6,133
Available-for-sale, total securities in a loss position, fair value 28,223 43,978
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 (3,228)
Available-for-sale, greater than 12 continuous months, unrealized loss (3,166) (143)
Available-for-sale, total securities in a loss position, unrealized loss (3,166) (3,371)
Debentures of government- sponsored agencies    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 0 38,645
Greater than or equal to 12 continuous months 117,157 80,711
Total securities in a loss position 117,157 119,356
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0 (2,530)
Greater than or equal to 12 continuous months (28,893) (23,937)
Held-to-maturity, gross unrealized losses (28,893) (26,467)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 19,054
Available-for-sale, greater than 12 continuous months, fair value 117,166 116,052
Available-for-sale, total securities in a loss position, fair value 117,166 135,106
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 (946)
Available-for-sale, greater than 12 continuous months, unrealized loss (11,971) (13,062)
Available-for-sale, total securities in a loss position, unrealized loss (11,971) (14,008)
U.S. Treasury securities    
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 0
Available-for-sale, greater than 12 continuous months, fair value 10,215 10,269
Available-for-sale, total securities in a loss position, fair value 10,215 10,269
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 0
Available-for-sale, greater than 12 continuous months, unrealized loss (1,703) (1,635)
Available-for-sale, total securities in a loss position, unrealized loss (1,703) (1,635)
Obligations of state and political subdivisions    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 3,034 15,155
Greater than or equal to 12 continuous months 47,051 36,603
Total securities in a loss position 50,085 51,758
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (43) (589)
Greater than or equal to 12 continuous months (12,023) (10,152)
Held-to-maturity, gross unrealized losses (12,066) (10,741)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 1,196 70,402
Available-for-sale, greater than 12 continuous months, fair value 82,526 28,711
Available-for-sale, total securities in a loss position, fair value 83,722 99,113
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss (36) (9,459)
Available-for-sale, greater than 12 continuous months, unrealized loss (18,735) (5,302)
Available-for-sale, total securities in a loss position, unrealized loss (18,771) (14,761)
Corporate bonds    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 0 28,448
Greater than or equal to 12 continuous months 28,206 0
Total securities in a loss position 28,206 28,448
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0 (1,552)
Greater than or equal to 12 continuous months (1,794) 0
Held-to-maturity, gross unrealized losses (1,794) (1,552)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 0
Available-for-sale, greater than 12 continuous months, fair value 34,556 33,276
Available-for-sale, total securities in a loss position, fair value 34,556 33,276
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 0
Available-for-sale, greater than 12 continuous months, unrealized loss (2,435) (3,714)
Available-for-sale, total securities in a loss position, unrealized loss (2,435) (3,714)
Asset-backed securities    
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 0
Available-for-sale, greater than 12 continuous months, fair value 0 1,462
Available-for-sale, total securities in a loss position, fair value 0 1,462
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 0
Available-for-sale, greater than 12 continuous months, unrealized loss 0 (91)
Available-for-sale, total securities in a loss position, unrealized loss $ 0 $ (91)