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Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Available for Sale:    
Number of positions, Less than 12 Months | security 7 247
Fair Value, Less than 12 Months $ 6,153 $ 726,431
Unrealized Losses, Less than 12 Months $ (80) $ (41,924)
Number of positions, 12 Months or More | security 160 98
Fair value, 12 Months or More $ 864,449 $ 788,657
Unrealized Losses, 12 Months or More $ (196,564) $ (159,375)
Number of positions | security 167 345
Fair Value $ 870,602 $ 1,515,088
Unrealized Losses $ (196,644) $ (201,299)
Held to Maturity:    
Number of positions, Less than 12 Months | security 0 122
Fair Value, Less than 12 Months $ 0 $ 448,575
Unrealized Losses, Less than 12 Months $ 0 $ (51,436)
Number of positions, 12 Months or More | security 237 115
Fair Value, 12 Months or More $ 1,079,120 $ 755,527
Unrealized Losses, 12 Months or More $ (166,504) $ (66,113)
Number of positions | security 237 237
Fair Value $ 1,079,120 $ 1,204,102
Unrealized Losses $ (166,504) $ (117,549)
Obligations of other U.S. Government agencies and corporations    
Available for Sale:    
Number of positions, Less than 12 Months | security   5
Fair Value, Less than 12 Months   $ 164,660
Unrealized Losses, Less than 12 Months   $ (5,340)
Number of positions, 12 Months or More | security   0
Fair value, 12 Months or More   $ 0
Unrealized Losses, 12 Months or More   $ 0
Number of positions | security   5
Fair Value   $ 164,660
Unrealized Losses   $ (5,340)
Obligations of states and political subdivisions    
Available for Sale:    
Number of positions, Less than 12 Months | security 6 84
Fair Value, Less than 12 Months $ 5,196 $ 96,939
Unrealized Losses, Less than 12 Months $ (27) $ (4,869)
Number of positions, 12 Months or More | security 16 11
Fair value, 12 Months or More $ 23,814 $ 33,038
Unrealized Losses, 12 Months or More $ (4,705) $ (4,499)
Number of positions | security 22 95
Fair Value $ 29,010 $ 129,977
Unrealized Losses $ (4,732) $ (9,368)
Held to Maturity:    
Number of positions, Less than 12 Months | security 0 105
Fair Value, Less than 12 Months $ 0 $ 191,442
Unrealized Losses, Less than 12 Months $ 0 $ (35,871)
Number of positions, 12 Months or More | security 129 24
Fair Value, 12 Months or More $ 231,393 $ 49,697
Unrealized Losses, 12 Months or More $ (57,660) $ (12,454)
Number of positions | security 129 129
Fair Value $ 231,393 $ 241,139
Unrealized Losses $ (57,660) $ (48,325)
Residential mortgage backed securities: | Government agency mortgage backed securities    
Available for Sale:    
Number of positions, Less than 12 Months | security 0 97
Fair Value, Less than 12 Months $ 0 $ 214,516
Unrealized Losses, Less than 12 Months $ 0 $ (15,115)
Number of positions, 12 Months or More | security 53 29
Fair value, 12 Months or More $ 267,412 $ 237,970
Unrealized Losses, 12 Months or More $ (49,799) $ (36,921)
Number of positions | security 53 126
Fair Value $ 267,412 $ 452,486
Unrealized Losses $ (49,799) $ (52,036)
Held to Maturity:    
Number of positions, Less than 12 Months | security 0 8
Fair Value, Less than 12 Months $ 0 $ 94,258
Unrealized Losses, Less than 12 Months $ 0 $ (4,186)
Number of positions, 12 Months or More | security 70 62
Fair Value, 12 Months or More $ 398,876 $ 364,870
Unrealized Losses, 12 Months or More $ (41,350) $ (20,246)
Number of positions | security 70 70
Fair Value $ 398,876 $ 459,128
Unrealized Losses $ (41,350) $ (24,432)
Residential mortgage backed securities: | Government agency collateralized mortgage obligations    
Available for Sale:    
Number of positions, Less than 12 Months | security 0 16
Fair Value, Less than 12 Months $ 0 $ 109,753
Unrealized Losses, Less than 12 Months $ 0 $ (8,552)
Number of positions, 12 Months or More | security 41 36
Fair value, 12 Months or More $ 392,897 $ 391,416
Unrealized Losses, 12 Months or More $ (108,896) $ (95,312)
Number of positions | security 41 52
Fair Value $ 392,897 $ 501,169
Unrealized Losses $ (108,896) $ (103,864)
Held to Maturity:    
Number of positions, Less than 12 Months | security 0 4
Fair Value, Less than 12 Months $ 0 $ 98,912
Unrealized Losses, Less than 12 Months $ 0 $ (5,479)
Number of positions, 12 Months or More | security 18 14
Fair Value, 12 Months or More $ 346,411 $ 293,698
Unrealized Losses, 12 Months or More $ (49,030) $ (25,227)
Number of positions | security 18 18
Fair Value $ 346,411 $ 392,610
Unrealized Losses $ (49,030) $ (30,706)
Commercial mortgage backed securities: | Government agency mortgage backed securities    
Available for Sale:    
Number of positions, Less than 12 Months | security 0 4
Fair Value, Less than 12 Months $ 0 $ 10,114
Unrealized Losses, Less than 12 Months $ 0 $ (1,053)
Number of positions, 12 Months or More | security 2 0
Fair value, 12 Months or More $ 5,128 $ 0
Unrealized Losses, 12 Months or More $ (908) $ 0
Number of positions | security 2 4
Fair Value $ 5,128 $ 10,114
Unrealized Losses $ (908) $ (1,053)
Held to Maturity:    
Number of positions, Less than 12 Months | security 0 1
Fair Value, Less than 12 Months $ 0 $ 13,745
Unrealized Losses, Less than 12 Months $ 0 $ (3,261)
Number of positions, 12 Months or More | security 1 0
Fair Value, 12 Months or More $ 13,189 $ 0
Unrealized Losses, 12 Months or More $ (3,800) $ 0
Number of positions | security 1 1
Fair Value $ 13,189 $ 13,745
Unrealized Losses $ (3,800) $ (3,261)
Commercial mortgage backed securities: | Government agency collateralized mortgage obligations    
Available for Sale:    
Number of positions, Less than 12 Months | security 0 16
Fair Value, Less than 12 Months $ 0 $ 67,026
Unrealized Losses, Less than 12 Months $ 0 $ (3,829)
Number of positions, 12 Months or More | security 28 21
Fair value, 12 Months or More $ 138,742 $ 118,821
Unrealized Losses, 12 Months or More $ (27,071) $ (21,760)
Number of positions | security 28 37
Fair Value $ 138,742 $ 185,847
Unrealized Losses $ (27,071) $ (25,589)
Held to Maturity:    
Number of positions, Less than 12 Months | security 0 2
Fair Value, Less than 12 Months $ 0 $ 7,651
Unrealized Losses, Less than 12 Months $ 0 $ (626)
Number of positions, 12 Months or More | security 9 7
Fair Value, 12 Months or More $ 36,490 $ 31,220
Unrealized Losses, 12 Months or More $ (8,235) $ (5,933)
Number of positions | security 9 9
Fair Value $ 36,490 $ 38,871
Unrealized Losses $ (8,235) $ (6,559)
Other debt securities    
Available for Sale:    
Number of positions, Less than 12 Months | security 1 25
Fair Value, Less than 12 Months $ 957 $ 63,423
Unrealized Losses, Less than 12 Months $ (53) $ (3,166)
Number of positions, 12 Months or More | security 20 1
Fair value, 12 Months or More $ 36,456 $ 7,412
Unrealized Losses, 12 Months or More $ (5,185) $ (883)
Number of positions | security 21 26
Fair Value $ 37,413 $ 70,835
Unrealized Losses $ (5,238) $ (4,049)
Held to Maturity:    
Number of positions, Less than 12 Months | security 0 2
Fair Value, Less than 12 Months $ 0 $ 42,567
Unrealized Losses, Less than 12 Months $ 0 $ (2,013)
Number of positions, 12 Months or More | security 10 8
Fair Value, 12 Months or More $ 52,761 $ 16,042
Unrealized Losses, 12 Months or More $ (6,429) $ (2,253)
Number of positions | security 10 10
Fair Value $ 52,761 $ 58,609
Unrealized Losses $ (6,429) $ (4,266)