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Investment Securities - Unrealized Loss Positions (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months $ 156,148 $ 359,313
Greater than or equal to 12 continuous months 637,574 459,948
Total Securities in a loss position 793,722 819,261
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (4,197) (23,733)
Greater than or equal to 12 continuous months (104,741) (103,305)
Held-to-maturity, gross unrealized losses (108,938) (127,038)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 25,789 354,695
Available-for-sale, greater than 12 continuous months, fair value 758,770 443,274
Available-for-sale, total securities in a loss position, fair value 784,559 797,969
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss (512) (33,887)
Available-for-sale, greater than 12 continuous months, unrealized loss (73,896) (56,656)
Available-for-sale, total securities in a loss position, unrealized loss (74,408) (90,543)
Marketable Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Marketable securities, less than 12 continuous months, fair value 181,937 714,008
Marketable securities, greater than 12 continuous months, fair value 1,396,344 903,222
Marketable securities, total securities in a loss position, fair value 1,578,281 1,617,230
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Marketable securities, less than 12 continuous months, unrealized loss (4,709) (57,620)
Marketable securities, greater than 12 continuous months, unrealized loss (178,637) (159,961)
Marketable securities, total securities in a loss position, unrealized loss (183,346) (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 9,107 62,627
Greater than or equal to 12 continuous months 268,577 218,507
Total Securities in a loss position 277,684 281,134
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (316) (5,960)
Greater than or equal to 12 continuous months (44,691) (44,187)
Held-to-maturity, gross unrealized losses (45,007) (50,147)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 7,729 44,630
Available-for-sale, greater than 12 continuous months, fair value 87,173 52,235
Available-for-sale, total securities in a loss position, fair value 94,902 96,865
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss (233) (4,501)
Available-for-sale, greater than 12 continuous months, unrealized loss (10,190) (7,632)
Available-for-sale, total securities in a loss position, unrealized loss (10,423) (12,133)
CMOs issued by FHLMC    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 44,217 78,144
Greater than or equal to 12 continuous months 150,466 113,796
Total Securities in a loss position 194,683 191,940
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (1,091) (5,874)
Greater than or equal to 12 continuous months (23,882) (23,629)
Held-to-maturity, gross unrealized losses (24,973) (29,503)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 13,194 169,760
Available-for-sale, greater than 12 continuous months, fair value 299,939 143,995
Available-for-sale, total securities in a loss position, fair value 313,133 313,755
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss (263) (15,144)
Available-for-sale, greater than 12 continuous months, unrealized loss (27,251) (18,538)
Available-for-sale, total securities in a loss position, unrealized loss (27,514) (33,682)
CMOs issued by FNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 37,106 106,485
Greater than or equal to 12 continuous months 41,538 0
Total Securities in a loss position 78,644 106,485
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (353) (5,419)
Greater than or equal to 12 continuous months (3,376) 0
Held-to-maturity, gross unrealized losses (3,729) (5,419)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 279 4,790
Available-for-sale, greater than 12 continuous months, fair value 31,321 27,529
Available-for-sale, total securities in a loss position, fair value 31,600 32,319
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss (4) (235)
Available-for-sale, greater than 12 continuous months, unrealized loss (3,178) (3,617)
Available-for-sale, total securities in a loss position, unrealized loss (3,182) (3,852)
CMOs issued by GNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 27,285 27,570
Greater than or equal to 12 continuous months 10,467 10,331
Total Securities in a loss position 37,752 37,901
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (1,802) (1,676)
Greater than or equal to 12 continuous months (1,218) (1,400)
Held-to-maturity, gross unrealized losses (3,020) (3,076)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 71 8,214
Available-for-sale, greater than 12 continuous months, fair value 27,014 23,612
Available-for-sale, total securities in a loss position, fair value 27,085 31,826
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss (1) (374)
Available-for-sale, greater than 12 continuous months, unrealized loss (2,742) (2,922)
Available-for-sale, total securities in a loss position, unrealized loss (2,743) (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 1,878 0
Total Securities in a loss position 1,878 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 (99) 0
Held-to-maturity, gross unrealized losses (99) (133)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 30 37,845
Available-for-sale, greater than 12 continuous months, fair value 37,580 6,133
Available-for-sale, total securities in a loss position, fair value 37,610 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 (2,578) (143)
Available-for-sale, total securities in a loss position, unrealized loss (2,578) (3,371)
Debentures of government- sponsored agencies    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 29,433 38,645
Greater than or equal to 12 continuous months 94,316 80,711
Total Securities in a loss position 123,749 119,356
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (561) (2,530)
Greater than or equal to 12 continuous months (21,588) (23,937)
Held-to-maturity, gross unrealized losses (22,149) (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 137,121 116,052
Available-for-sale, total securities in a loss position, fair value 137,121 135,106
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 (12,000) (13,062)
Available-for-sale, total securities in a loss position, unrealized loss (12,000) (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 10,523 10,269
Available-for-sale, total securities in a loss position, fair value 10,523 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 (1,385) (1,635)
Available-for-sale, total securities in a loss position, unrealized loss (1,385) (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 9,000 15,155
Greater than or equal to 12 continuous months 41,565 36,603
Total Securities in a loss position 50,565 51,758
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (74) (589)
Greater than or equal to 12 continuous months (8,654) (10,152)
Held-to-maturity, gross unrealized losses (8,728) (10,741)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, fair value 4,486 70,402
Available-for-sale, greater than 12 continuous months, fair value 92,776 28,711
Available-for-sale, total securities in a loss position, fair value 97,262 99,113
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, unrealized loss (11) (9,459)
Available-for-sale, greater than 12 continuous months, unrealized loss (11,486) (5,302)
Available-for-sale, total securities in a loss position, unrealized loss (11,497) (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 28,767 0
Total Securities in a loss position 28,767 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 (1,233) 0
Held-to-maturity, gross unrealized losses (1,233) (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 33,962 33,276
Available-for-sale, total securities in a loss position, fair value 33,962 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 (3,029) (3,714)
Available-for-sale, total securities in a loss position, unrealized loss (3,029) (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 1,361 1,462
Available-for-sale, total securities in a loss position, fair value 1,361 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 (57) (91)
Available-for-sale, total securities in a loss position, unrealized loss $ (57) $ (91)