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Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Available for Sale:    
Number of positions, Less than 12 Months | security 6 247
Fair Value, Less than 12 Months $ 6,819 $ 726,431
Unrealized Losses, Less than 12 Months $ (222) $ (41,924)
Number of positions, 12 Months or More | security 127 98
Fair Value, 12 Months or More $ 685,774 $ 788,657
Unrealized Losses, 12 Months or More $ (139,572) $ (159,375)
Number of positions | security 133 345
Fair Value $ 692,593 $ 1,515,088
Unrealized Losses $ (139,794) $ (201,299)
Held to Maturity:    
Number of positions, Less than 12 Months | security 2 122
Fair Value, Less than 12 Months $ 2,807 $ 448,575
Unrealized Losses, Less than 12 Months $ (25) $ (51,435)
Number of positions, 12 Months or More | security 234 115
Fair Value, 12 Months or More $ 1,117,285 $ 755,527
Unrealized Losses, 12 Months or More $ (99,715) $ (66,112)
Number of positions | security 236 237
Fair Value $ 1,120,092 $ 1,204,102
Unrealized Losses $ (99,740) $ (117,547)
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 3 84
Fair Value, Less than 12 Months $ 2,914 $ 96,939
Unrealized Losses, Less than 12 Months $ (2) $ (4,869)
Number of positions, 12 Months or More | security 9 11
Fair Value, 12 Months or More $ 15,198 $ 33,038
Unrealized Losses, 12 Months or More $ (1,881) $ (4,499)
Number of positions | security 12 95
Fair Value $ 18,112 $ 129,977
Unrealized Losses $ (1,883) $ (9,368)
Held to Maturity:    
Number of positions, Less than 12 Months | security 2 105
Fair Value, Less than 12 Months $ 2,807 $ 191,442
Unrealized Losses, Less than 12 Months $ (25) $ (35,870)
Number of positions, 12 Months or More | security 126 24
Fair Value, 12 Months or More $ 249,995 $ 49,697
Unrealized Losses, 12 Months or More $ (33,663) $ (12,454)
Number of positions | security 128 129
Fair Value $ 252,802 $ 241,139
Unrealized Losses $ (33,688) $ (48,324)
Other debt securities    
Available for Sale:    
Number of positions, Less than 12 Months | security 2 25
Fair Value, Less than 12 Months $ 3,099 $ 63,423
Unrealized Losses, Less than 12 Months $ (195) $ (3,167)
Number of positions, 12 Months or More | security 19 1
Fair Value, 12 Months or More $ 35,072 $ 7,412
Unrealized Losses, 12 Months or More $ (4,263) $ (883)
Number of positions | security 21 26
Fair Value $ 38,171 $ 70,835
Unrealized Losses $ (4,458) $ (4,050)
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 $ 54,254 $ 16,042
Unrealized Losses, 12 Months or More $ (4,119) $ (2,253)
Number of positions | security 10 10
Fair Value $ 54,254 $ 58,609
Unrealized Losses $ (4,119) $ (4,266)
Government agency mortgage-backed securities | Residential mortgage-backed securities    
Available for Sale:    
Number of positions, Less than 12 Months | security 1 97
Fair Value, Less than 12 Months $ 806 $ 214,516
Unrealized Losses, Less than 12 Months $ (25) $ (15,115)
Number of positions, 12 Months or More | security 35 29
Fair Value, 12 Months or More $ 166,963 $ 237,970
Unrealized Losses, 12 Months or More $ (24,943) $ (36,921)
Number of positions | security 36 126
Fair Value $ 167,769 $ 452,486
Unrealized Losses $ (24,968) $ (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 $ 405,950 $ 364,870
Unrealized Losses, 12 Months or More $ (20,314) $ (20,246)
Number of positions | security 70 70
Fair Value $ 405,950 $ 459,128
Unrealized Losses $ (20,314) $ (24,432)
Government agency mortgage-backed securities | Commercial 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 $ 5,392 $ 0
Unrealized Losses, 12 Months or More $ (637) $ 0
Number of positions | security 2 4
Fair Value $ 5,392 $ 10,114
Unrealized Losses $ (637) $ (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 $ 14,011 $ 0
Unrealized Losses, 12 Months or More $ (2,972) $ 0
Number of positions | security 1 1
Fair Value $ 14,011 $ 13,745
Unrealized Losses $ (2,972) $ (3,261)
Government agency collateralized mortgage obligations | Residential mortgage-backed securities    
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 37 36
Fair Value, 12 Months or More $ 354,574 $ 391,416
Unrealized Losses, 12 Months or More $ (85,883) $ (95,312)
Number of positions | security 37 52
Fair Value $ 354,574 $ 501,169
Unrealized Losses $ (85,883) $ (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 $ 355,538 $ 293,698
Unrealized Losses, 12 Months or More $ (31,670) $ (25,227)
Number of positions | security 18 18
Fair Value $ 355,538 $ 392,610
Unrealized Losses $ (31,670) $ (30,706)
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities    
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 $ (3,828)
Number of positions, 12 Months or More | security 25 21
Fair Value, 12 Months or More $ 108,575 $ 118,821
Unrealized Losses, 12 Months or More $ (21,965) $ (21,760)
Number of positions | security 25 37
Fair Value $ 108,575 $ 185,847
Unrealized Losses $ (21,965) $ (25,588)
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 $ 37,537 $ 31,220
Unrealized Losses, 12 Months or More $ (6,977) $ (5,932)
Number of positions | security 9 9
Fair Value $ 37,537 $ 38,871
Unrealized Losses $ (6,977) $ (6,558)