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Investment Securities - Unrealized Loss Positions (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months $ 135,529 $ 359,313
Greater than or equal to 12 continuous months 648,324 459,948
Total Securities in a loss position 783,853 819,261
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (6,011) (23,733)
Greater than or equal to 12 continuous months (115,242) (103,305)
Held-to-maturity, gross unrealized losses (121,253) (127,038)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 9,299 354,695
Available-for-sale, greater than 12 continuous months, fair value 749,563 443,274
Available-for-sale, total securities in a loss position, fair value 758,862 797,969
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss (232) (33,887)
Available-for-sale, greater than 12 continuous months, unrealized loss (85,061) (56,656)
Available-for-sale, total securities in a loss position, unrealized loss (85,293) (90,543)
Marketable Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Marketable securities, less than 12 continuous months, fair value 144,828 714,008
Marketable securities, greater than 12 continuous months, fair value 1,397,887 903,222
Marketable securities, total securities in a loss position, fair value 1,542,715 1,617,230
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Marketable securities, less than 12 continuous months, unrealized loss (6,243) (57,620)
Marketable securities, greater than 12 continuous months, unrealized loss (200,303) (159,961)
Marketable securities, total securities in a loss position, unrealized loss (206,546) (217,581)
MBS pass-through securities issued by FHLMC, FNMA and GNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 4,178 62,627
Greater than or equal to 12 continuous months 263,886 218,507
Total Securities in a loss position 268,064 281,134
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (132) (5,960)
Greater than or equal to 12 continuous months (48,772) (44,187)
Held-to-maturity, gross unrealized losses (48,904) (50,147)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 4,422 44,630
Available-for-sale, greater than 12 continuous months, fair value 85,498 52,235
Available-for-sale, total securities in a loss position, fair value 89,920 96,865
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss (177) (4,501)
Available-for-sale, greater than 12 continuous months, unrealized loss (11,581) (7,632)
Available-for-sale, total securities in a loss position, unrealized loss (11,758) (12,133)
CMOs issued by FHLMC    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 31,915 78,144
Greater than or equal to 12 continuous months 162,369 113,796
Total Securities in a loss position 194,284 191,940
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (1,171) (5,874)
Greater than or equal to 12 continuous months (26,588) (23,629)
Held-to-maturity, gross unrealized losses (27,759) (29,503)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 12 169,760
Available-for-sale, greater than 12 continuous months, fair value 301,200 143,995
Available-for-sale, total securities in a loss position, fair value 301,212 313,755
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss 0 (15,144)
Available-for-sale, greater than 12 continuous months, unrealized loss (32,162) (18,538)
Available-for-sale, total securities in a loss position, unrealized loss (32,162) (33,682)
CMOs issued by FNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 43,167 106,485
Greater than or equal to 12 continuous months 39,161 0
Total Securities in a loss position 82,328 106,485
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (2,064) (5,419)
Greater than or equal to 12 continuous months (4,372) 0
Held-to-maturity, gross unrealized losses (6,436) (5,419)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 37 4,790
Available-for-sale, greater than 12 continuous months, fair value 29,063 27,529
Available-for-sale, total securities in a loss position, fair value 29,100 32,319
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss (1) (235)
Available-for-sale, greater than 12 continuous months, unrealized loss (3,815) (3,617)
Available-for-sale, total securities in a loss position, unrealized loss (3,816) (3,852)
CMOs issued by GNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 27,024 27,570
Greater than or equal to 12 continuous months 9,902 10,331
Total Securities in a loss position 36,926 37,901
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (1,895) (1,676)
Greater than or equal to 12 continuous months (1,376) (1,400)
Held-to-maturity, gross unrealized losses (3,271) (3,076)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 0 8,214
Available-for-sale, greater than 12 continuous months, fair value 25,070 23,612
Available-for-sale, total securities in a loss position, fair value 25,070 31,826
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss 0 (374)
Available-for-sale, greater than 12 continuous months, unrealized loss (3,377) (2,922)
Available-for-sale, total securities in a loss position, unrealized loss (3,377) (3,296)
SBA-backed securities    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 0 2,239
Greater than or equal to 12 continuous months 1,847 0
Total Securities in a loss position 1,847 2,239
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months 0 (133)
Greater than or equal to 12 continuous months (130) 0
Held-to-maturity, gross unrealized losses (130) (133)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 29 37,845
Available-for-sale, greater than 12 continuous months, fair value 36,309 6,133
Available-for-sale, total securities in a loss position, fair value 36,338 43,978
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss 0 (3,228)
Available-for-sale, greater than 12 continuous months, unrealized loss (3,175) (143)
Available-for-sale, total securities in a loss position, unrealized loss (3,175) (3,371)
Debentures of government- sponsored agencies    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 29,245 38,645
Greater than or equal to 12 continuous months 92,642 80,711
Total Securities in a loss position 121,887 119,356
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (749) (2,530)
Greater than or equal to 12 continuous months (23,338) (23,937)
Held-to-maturity, gross unrealized losses (24,087) (26,467)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 0 19,054
Available-for-sale, greater than 12 continuous months, fair value 135,868 116,052
Available-for-sale, total securities in a loss position, fair value 135,868 135,106
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss 0 (946)
Available-for-sale, greater than 12 continuous months, unrealized loss (13,261) (13,062)
Available-for-sale, total securities in a loss position, unrealized loss (13,261) (14,008)
U.S. Treasury securities    
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 0 0
Available-for-sale, greater than 12 continuous months, fair value 10,334 10,269
Available-for-sale, total securities in a loss position, fair value 10,334 10,269
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss 0 0
Available-for-sale, greater than 12 continuous months, unrealized loss (1,580) (1,635)
Available-for-sale, total securities in a loss position, unrealized loss (1,580) (1,635)
Obligations of state and political subdivisions    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 0 15,155
Greater than or equal to 12 continuous months 50,154 36,603
Total Securities in a loss position 50,154 51,758
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months 0 (589)
Greater than or equal to 12 continuous months (9,029) (10,152)
Held-to-maturity, gross unrealized losses (9,029) (10,741)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 4,799 70,402
Available-for-sale, greater than 12 continuous months, fair value 90,869 28,711
Available-for-sale, total securities in a loss position, fair value 95,668 99,113
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss (54) (9,459)
Available-for-sale, greater than 12 continuous months, unrealized loss (13,106) (5,302)
Available-for-sale, total securities in a loss position, unrealized loss (13,160) (14,761)
Corporate bonds    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 0 28,448
Greater than or equal to 12 continuous months 28,363 0
Total Securities in a loss position 28,363 28,448
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months 0 (1,552)
Greater than or equal to 12 continuous months (1,637) 0
Held-to-maturity, gross unrealized losses (1,637) (1,552)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 0 0
Available-for-sale, greater than 12 continuous months, fair value 34,043 33,276
Available-for-sale, total securities in a loss position, fair value 34,043 33,276
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss 0 0
Available-for-sale, greater than 12 continuous months, unrealized loss (2,948) (3,714)
Available-for-sale, total securities in a loss position, unrealized loss (2,948) (3,714)
Asset-backed securities    
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 0 0
Available-for-sale, greater than 12 continuous months, fair value 1,309 1,462
Available-for-sale, total securities in a loss position, fair value 1,309 1,462
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss 0 0
Available-for-sale, greater than 12 continuous months, unrealized loss (56) (91)
Available-for-sale, total securities in a loss position, unrealized loss $ (56) $ (91)