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Securities - Securities with gross unrealized losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months $ 14,601 $ 115,297
Twelve Months or More 394,460 317,776
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 103,696 952,682
Twelve Months or More 2,123,916 1,297,486
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 20,661 197,789
Twelve Months or More 796,047 695,584
Securities Available for Sale, Fair Value    
Less Than Twelve Months 427,481 2,082,068
Twelve Months or More 4,656,179 3,073,871
U.S. Treasuries    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months   6,778
Twelve Months or More 4,939  
Securities Available for Sale, Fair Value    
Less Than Twelve Months   265,638
Twelve Months or More 268,096  
U.S. Government agencies    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months   5,514
Twelve Months or More 28,175 24,273
Securities Held to Maturity, Fair Value    
Less Than Twelve Months   78,833
Twelve Months or More 169,089 88,642
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,065 8,193
Twelve Months or More 24,677 18,691
Securities Available for Sale, Fair Value    
Less Than Twelve Months 53,935 138,807
Twelve Months or More 166,324 80,281
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months   65,181
Twelve Months or More 238,470 189,912
Securities Held to Maturity, Fair Value    
Less Than Twelve Months   513,086
Twelve Months or More 1,314,903 823,467
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 1,027 42,767
Twelve Months or More 277,536 255,285
Securities Available for Sale, Fair Value    
Less Than Twelve Months 32,334 459,773
Twelve Months or More 1,640,828 1,238,580
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 1,187 30,284
Twelve Months or More 62,130 39,380
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 45,925 277,868
Twelve Months or More 359,552 127,128
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 2,650 21,450
Twelve Months or More 95,513 85,842
Securities Available for Sale, Fair Value    
Less Than Twelve Months 73,464 274,082
Twelve Months or More 517,948 326,963
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Securities Held to Maturity, Gross Unrealized Losses    
Less Than Twelve Months 13,414 14,318
Twelve Months or More 54,727 51,986
Securities Held to Maturity, Fair Value    
Less Than Twelve Months 57,771 82,895
Twelve Months or More 235,050 213,387
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 10,606 17,156
Twelve Months or More 182,288 181,688
Securities Available for Sale, Fair Value    
Less Than Twelve Months 107,009 206,228
Twelve Months or More 874,332 767,002
State and municipal obligations    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 4,250 97,084
Twelve Months or More 167,606 108,799
Securities Available for Sale, Fair Value    
Less Than Twelve Months 74,784 616,631
Twelve Months or More 888,984 391,848
Small Business Administration loan-backed securities    
Securities Held to Maturity, Gross Unrealized Losses    
Twelve Months or More 10,958 12,225
Securities Held to Maturity, Fair Value    
Twelve Months or More 45,322 44,862
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 428 2,152
Twelve Months or More 40,736 44,543
Securities Available for Sale, Fair Value    
Less Than Twelve Months 80,092 92,535
Twelve Months or More 278,346 264,933
Corporate securities.    
Securities Available for Sale, Gross Unrealized Losses    
Less Than Twelve Months 635 2,209
Twelve Months or More 2,752 736
Securities Available for Sale, Fair Value    
Less Than Twelve Months 5,863 28,374
Twelve Months or More $ 21,321 $ 4,264