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Securities - General Disclosures (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) security shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) security shares | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) security shares
Debt securities available for sale |  |  |  |  |
Amortized Cost | $ 3,447,504 |  | $ 3,447,504 |  | $ 2,211,543
Gross Unrealized Gains | 36,293 |  | 36,293 |  | 50,317
Gross Unrealized Losses | (19,280) |  | (19,280) |  | (673)
Fair Value | 3,464,517 |  | 3,464,517 |  | 2,261,187
Debt securities available for sale, Amortized Cost |  |  |  |  |
Due in one year or less | 122,809 |  | 122,809 |  |
Due after one year through five years | 573,422 |  | 573,422 |  |
Due after five years through ten years | 398,111 |  | 398,111 |  |
Due after ten years | 2,353,162 |  | 2,353,162 |  |
Amortized Cost | 3,447,504 |  | 3,447,504 |  | 2,211,543
Debt securities available for sale, Fair Value |  |  |  |  |
Due in one year or less | 123,502 |  | 123,502 |  |
Due after one year through five years | 579,219 |  | 579,219 |  |
Due after five years through ten years | 407,150 |  | 407,150 |  |
Due after ten years | 2,354,646 |  | 2,354,646 |  |
Fair Value | 3,464,517 |  | 3,464,517 |  | 2,261,187
Realized gains and losses on sales of debt securities |  |  |  |  |
Gross security gains | 499 | $ 146 | 524 | $ 1,707 |
Gross security (losses) | (405) | (3) | (405) | (8) |
Net gains (losses) on sales of debt securities | 94 | $ 143 | 119 | $ 1,699 |
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 1,893,514 |  | 1,893,514 |  | 221,913
Continuous unrealized losses existing for greater than 12 months, gross | 344 |  | 344 |  | 5,096
Total, gross | 1,893,858 |  | 1,893,858 |  | 227,009
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (19,276) |  | (19,276) |  | (621)
Continuous unrealized losses existing greater than 12 months, gross | (4) |  | (4) |  | (52)
Total, gross | $ (19,280) |  | $ (19,280) |  | $ (673)
Debt security portfolio | shares | 1,249 |  | 1,249 |  | 1,114
Number of securities in unrealized loss position | security | 252 |  | 252 |  | 23
Securities in unrealized loss position as a percentage of aggregate carrying value of investments | 1.02% |  | 1.02% |  | 0.30%
Collateral |  |  |  |  |
Realized gains and losses on sales of debt securities |  |  |  |  |
Carrying amount of debt securities pledged as collateral for public deposits, securities sold under agreements to repurchase and for other purposes | $ 703,100 |  | $ 703,100 |  | $ 628,000
U.S. Treasury securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 212,022 |  | 212,022 |  | 27,481
Gross Unrealized Gains | 150 |  | 150 |  | 356
Gross Unrealized Losses | (279) |  | (279) |  |
Fair Value | 211,893 |  | 211,893 |  | 27,837
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 212,022 |  | 212,022 |  | 27,481
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 211,893 |  | 211,893 |  | 27,837
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 150,811 |  | 150,811 |  |
Total, gross | 150,811 |  | 150,811 |  |
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (279) |  | (279) |  |
Total, gross | (279) |  | (279) |  |
Obligations of U.S. government corporations and agencies |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 49,528 |  | 49,528 |  | 67,406
Gross Unrealized Gains | 1,470 |  | 1,470 |  | 2,162
Gross Unrealized Losses |  |  |  |  | (49)
Fair Value | 50,998 |  | 50,998 |  | 69,519
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 49,528 |  | 49,528 |  | 67,406
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 50,998 |  | 50,998 |  | 69,519
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  |  | 4,957
Total, gross |  |  |  |  | 4,957
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing greater than 12 months, gross |  |  |  |  | (49)
Total, gross |  |  |  |  | (49)
Obligations of states and political subdivisions |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 292,221 |  | 292,221 |  | 292,940
Gross Unrealized Gains | 9,634 |  | 9,634 |  | 11,779
Gross Unrealized Losses | (513) |  | (513) |  | (8)
Fair Value | 301,342 |  | 301,342 |  | 304,711
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 292,221 |  | 292,221 |  | 292,940
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 301,342 |  | 301,342 |  | 304,711
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 48,579 |  | 48,579 |  | 762
Total, gross | 48,579 |  | 48,579 |  | 762
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (513) |  | (513) |  | (8)
Total, gross | (513) |  | (513) |  | (8)
Commercial mortgage-backed securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 513,067 |  | 513,067 |  | 408,716
Gross Unrealized Gains | 6,528 |  | 6,528 |  | 10,212
Gross Unrealized Losses | (5,543) |  | (5,543) |  | (312)
Fair Value | 514,052 |  | 514,052 |  | 418,616
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 513,067 |  | 513,067 |  | 408,716
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 514,052 |  | 514,052 |  | 418,616
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 322,082 |  | 322,082 |  | 129,655
Total, gross | 322,082 |  | 322,082 |  | 129,655
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (5,543) |  | (5,543) |  | (312)
Total, gross | (5,543) |  | (5,543) |  | (312)
Residential mortgage-backed securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 1,837,271 |  | 1,837,271 |  | 1,344,047
Gross Unrealized Gains | 16,875 |  | 16,875 |  | 24,571
Gross Unrealized Losses | (11,952) |  | (11,952) |  | (303)
Fair Value | 1,842,194 |  | 1,842,194 |  | 1,368,315
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 1,837,271 |  | 1,837,271 |  | 1,344,047
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 1,842,194 |  | 1,842,194 |  | 1,368,315
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 1,073,263 |  | 1,073,263 |  | 89,997
Continuous unrealized losses existing for greater than 12 months, gross | 344 |  | 344 |  | 139
Total, gross | 1,073,607 |  | 1,073,607 |  | 90,136
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (11,948) |  | (11,948) |  | (300)
Continuous unrealized losses existing greater than 12 months, gross | (4) |  | (4) |  | (3)
Total, gross | (11,952) |  | (11,952) |  | (303)
Asset-backed securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 246,998 |  | 246,998 |  |
Gross Unrealized Gains | 179 |  | 179 |  |
Gross Unrealized Losses | (180) |  | (180) |  |
Fair Value | 246,997 |  | 246,997 |  |
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 246,998 |  | 246,998 |  |
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 246,997 |  | 246,997 |  |
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 98,703 |  | 98,703 |  |
Total, gross | 98,703 |  | 98,703 |  |
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (180) |  | (180) |  |
Total, gross | (180) |  | (180) |  |
Corporate debt securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 296,397 |  | 296,397 |  | 70,953
Gross Unrealized Gains | 1,457 |  | 1,457 |  | 1,237
Gross Unrealized Losses | (813) |  | (813) |  | (1)
Fair Value | 297,041 |  | 297,041 |  | 72,189
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 296,397 |  | 296,397 |  | 70,953
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 297,041 |  | 297,041 |  | 72,189
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 200,076 |  | 200,076 |  | 1,499
Total, gross | 200,076 |  | 200,076 |  | 1,499
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (813) |  | (813) |  | (1)
Total, gross | $ (813) |  | $ (813) |  | $ (1)

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