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Securities - General Disclosures (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) security shares | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) security shares
Debt securities available for sale |  |  |
Amortized Cost | $ 2,789,408 |  | $ 2,211,543
Gross Unrealized Gains | 35,676 |  | 50,317
Gross Unrealized Losses | (28,129) |  | (673)
Fair Value | 2,796,955 |  | 2,261,187
Debt securities available for sale, Amortized Cost |  |  |
Due in one year or less | 100,016 |  |
Due after one year through five years | 291,357 |  |
Due after five years through ten years | 303,453 |  |
Due after ten years | 2,094,582 |  |
Amortized Cost | 2,789,408 |  | 2,211,543
Debt securities available for sale, Fair Value |  |  |
Due in one year or less | 100,789 |  |
Due after one year through five years | 297,624 |  |
Due after five years through ten years | 309,672 |  |
Due after ten years | 2,088,870 |  |
Fair Value | 2,796,955 |  | 2,261,187
Realized gains and losses related to sales and calls of securities AFS |  |  |
Gross security gains | 25 | $ 1,561 |
Gross security (losses) |  | (5) |
Net gains (losses) on sales of debt securities | 25 | $ 1,556 |
Debt securities available for sale, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 1,487,290 |  | 221,913
Continuous unrealized losses existing for greater than 12 months, gross | 5,047 |  | 5,096
Total, gross | 1,492,337 |  | 227,009
Debt securities available for sale, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (28,080) |  | (621)
Continuous unrealized losses existing greater than 12 months, gross | (49) |  | (52)
Total, gross | $ (28,129) |  | $ (673)
Debt security portfolio | shares | 1,108 |  | 1,114
Number of securities in unrealized loss position | security | 192 |  | 23
Securities in unrealized loss position as a percentage of aggregate carrying value of investments | 1.88% |  | 0.30%
Collateral |  |  |
Realized gains and losses related to sales and calls of securities AFS |  |  |
Carrying amount of investment securities pledged as collateral | $ 562,600 |  | $ 628,000
U.S. Treasury securities |  |  |
Debt securities available for sale |  |  |
Amortized Cost | 23,514 |  | 27,481
Gross Unrealized Gains | 243 |  | 356
Fair Value | 23,757 |  | 27,837
Debt securities available for sale, Amortized Cost |  |  |
Amortized Cost | 23,514 |  | 27,481
Debt securities available for sale, Fair Value |  |  |
Fair Value | 23,757 |  | 27,837
Obligations of U.S. government corporations and agencies |  |  |
Debt securities available for sale |  |  |
Amortized Cost | 64,903 |  | 67,406
Gross Unrealized Gains | 1,720 |  | 2,162
Gross Unrealized Losses | (45) |  | (49)
Fair Value | 66,578 |  | 69,519
Debt securities available for sale, Amortized Cost |  |  |
Amortized Cost | 64,903 |  | 67,406
Debt securities available for sale, Fair Value |  |  |
Fair Value | 66,578 |  | 69,519
Debt securities available for sale, Fair Value |  |  |
Continuous unrealized losses existing for greater than 12 months, gross | 4,695 |  | 4,957
Total, gross | 4,695 |  | 4,957
Debt securities available for sale, Unrealized Losses |  |  |
Continuous unrealized losses existing greater than 12 months, gross | (45) |  | (49)
Total, gross | (45) |  | (49)
Obligations of states and political subdivisions |  |  |
Debt securities available for sale |  |  |
Amortized Cost | 280,150 |  | 292,940
Gross Unrealized Gains | 8,854 |  | 11,779
Gross Unrealized Losses | (1,542) |  | (8)
Fair Value | 287,462 |  | 304,711
Debt securities available for sale, Amortized Cost |  |  |
Amortized Cost | 280,150 |  | 292,940
Debt securities available for sale, Fair Value |  |  |
Fair Value | 287,462 |  | 304,711
Debt securities available for sale, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 58,555 |  | 762
Total, gross | 58,555 |  | 762
Debt securities available for sale, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (1,542) |  | (8)
Total, gross | (1,542) |  | (8)
Commercial mortgage-backed securities |  |  |
Debt securities available for sale |  |  |
Amortized Cost | 499,996 |  | 408,716
Gross Unrealized Gains | 5,308 |  | 10,212
Gross Unrealized Losses | (6,786) |  | (312)
Fair Value | 498,518 |  | 418,616
Debt securities available for sale, Amortized Cost |  |  |
Amortized Cost | 499,996 |  | 408,716
Debt securities available for sale, Fair Value |  |  |
Fair Value | 498,518 |  | 418,616
Debt securities available for sale, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 314,109 |  | 129,655
Total, gross | 314,109 |  | 129,655
Debt securities available for sale, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (6,786) |  | (312)
Total, gross | (6,786) |  | (312)
Residential mortgage-backed securities |  |  |
Debt securities available for sale |  |  |
Amortized Cost | 1,786,062 |  | 1,344,047
Gross Unrealized Gains | 18,587 |  | 24,571
Gross Unrealized Losses | (18,329) |  | (303)
Fair Value | 1,786,320 |  | 1,368,315
Debt securities available for sale, Amortized Cost |  |  |
Amortized Cost | 1,786,062 |  | 1,344,047
Debt securities available for sale, Fair Value |  |  |
Fair Value | 1,786,320 |  | 1,368,315
Debt securities available for sale, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 1,019,462 |  | 89,997
Continuous unrealized losses existing for greater than 12 months, gross | 352 |  | 139
Total, gross | 1,019,814 |  | 90,136
Debt securities available for sale, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (18,325) |  | (300)
Continuous unrealized losses existing greater than 12 months, gross | (4) |  | (3)
Total, gross | (18,329) |  | (303)
Corporate debt securities |  |  |
Debt securities available for sale |  |  |
Amortized Cost | 134,783 |  | 70,953
Gross Unrealized Gains | 964 |  | 1,237
Gross Unrealized Losses | (1,427) |  | (1)
Fair Value | 134,320 |  | 72,189
Debt securities available for sale, Amortized Cost |  |  |
Amortized Cost | 134,783 |  | 70,953
Debt securities available for sale, Fair Value |  |  |
Fair Value | 134,320 |  | 72,189
Debt securities available for sale, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 95,164 |  | 1,499
Total, gross | 95,164 |  | 1,499
Debt securities available for sale, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (1,427) |  | (1)
Total, gross | $ (1,427) |  | $ (1)

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