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Debt Securities - General Disclosures (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) item shares | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) item shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Securities |  |  |  |  |
Equity securities consisting of common stock and money market mutual funds, fair value | $ 5,952 |  | $ 5,952 | $ 6,169 |
Unrealized (losses) gains recognized on equity securities |  |  | (759) | 2,162 |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 1,627,065 |  | 1,627,065 | 707,213 |
Gross Unrealized Gains | 22,021 |  | 22,021 | 798 |
Gross Unrealized Losses | (829) |  | (829) | (10,326) |
Fair Value | 1,648,257 |  | 1,648,257 | 697,685 |
Debt securities held to maturity |  |  |  |  |
Amortized Cost |  |  |  | 608,660 |
Gross Unrealized Gains |  |  |  | 1,827 |
Gross Unrealized Losses |  |  |  | (7,127) |
Fair Value |  |  |  | 603,360 |
Debt securities available for sale, Amortized Cost |  |  |  |  |
Due in one year or less | 149,566 |  | 149,566 |  |
Due after one year through five years | 355,497 |  | 355,497 |  |
Due after five years through ten years | 228,518 |  | 228,518 |  |
Due after ten years | 893,484 |  | 893,484 |  |
Amortized Cost | 1,627,065 |  | 1,627,065 | 707,213 |
Debt securities available for sale, Fair Value |  |  |  |  |
Due in one year or less | 150,109 |  | 150,109 |  |
Due after one year through five years | 361,500 |  | 361,500 |  |
Due after five years through ten years | 232,950 |  | 232,950 |  |
Due after ten years | 903,698 |  | 903,698 |  |
Fair Value | 1,648,257 |  | 1,648,257 | 697,685 |
Realized gains and losses related to sales and calls of securities AFS |  |  |  |  |
Gross security gains |  |  | 1,318 |  | $ 1,259
Gross security (losses) |  |  | (585) | (1,780) | (116)
Net (losses) gains on sales of securities |  |  | 733 | (1,780) | $ 1,143
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 122,991 |  | 122,991 | 190,737 |
Continuous unrealized losses existing for greater than 12 months, gross | 53,851 |  | 53,851 | 417,336 |
Total, gross | 176,842 |  | 176,842 | 608,073 |
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (448) |  | (448) | (1,231) |
Continuous unrealized losses existing greater than 12 months, gross | (381) |  | (381) | (9,095) |
Total, gross | $ (829) |  | $ (829) | (10,326) |
Debt securities held to maturity, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  | 98,669 |
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  | 299,707 |
Total, gross |  |  |  | 398,376 |
Debt securities held to maturity, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  | (1,219) |
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  | (5,908) |
Total, gross |  |  |  | (7,127) |
Security portfolio evaluated for other-than-temporary impairment | shares | 1,178 |  | 1,178 |  |
Number of securities in unrealized loss position | item | 55 |  | 55 |  |
Securities in unrealized loss position as a percentage of aggregate carrying value of investments | 0.47% |  | 0.47% |  |
Collateral |  |  |  |  |
Realized gains and losses related to sales and calls of securities AFS |  |  |  |  |
Carrying amount of investment securities pledged as collateral | $ 704,700 |  | $ 704,700 | 498,300 |
U.S. Treasury securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 51,472 |  | 51,472 | 25,824 |
Gross Unrealized Gains | 265 |  | 265 | 1 |
Gross Unrealized Losses |  |  |  | (414) |
Fair Value | 51,737 |  | 51,737 | 25,411 |
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 51,472 |  | 51,472 | 25,824 |
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 51,737 |  | 51,737 | 25,411 |
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  | 995 |
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  | 24,343 |
Total, gross |  |  |  | 25,338 |
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  | (4) |
Continuous unrealized losses existing greater than 12 months, gross |  |  |  | (410) |
Total, gross |  |  |  | (414) |
Obligations of U.S. government corporations and agencies |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 160,364 |  | 160,364 | 53,096 |
Gross Unrealized Gains | 2,684 |  | 2,684 | 7 |
Gross Unrealized Losses | (48) |  | (48) | (761) |
Fair Value | 163,000 |  | 163,000 | 52,342 |
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 160,364 |  | 160,364 | 53,096 |
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 163,000 |  | 163,000 | 52,342 |
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 6,362 |  | 6,362 | 749 |
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  | 50,744 |
Total, gross | 6,362 |  | 6,362 | 51,493 |
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (48) |  | (48) | (3) |
Continuous unrealized losses existing greater than 12 months, gross |  |  |  | (758) |
Total, gross | (48) |  | (48) | (761) |
Obligations of states and political subdivisions |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 262,492 |  | 262,492 | 171,131 |
Gross Unrealized Gains | 5,810 |  | 5,810 | 484 |
Gross Unrealized Losses | (11) |  | (11) | (1,571) |
Fair Value | 268,291 |  | 268,291 | 170,044 |
Debt securities held to maturity |  |  |  |  |
Amortized Cost |  |  |  | 33,947 |
Gross Unrealized Gains |  |  |  | 68 |
Gross Unrealized Losses |  |  |  | (87) |
Fair Value |  |  |  | 33,928 |
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 262,492 |  | 262,492 | 171,131 |
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 268,291 |  | 268,291 | 170,044 |
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 4,981 |  | 4,981 | 49,893 |
Continuous unrealized losses existing for greater than 12 months, gross | 1,548 |  | 1,548 | 77,651 |
Total, gross | 6,529 |  | 6,529 | 127,544 |
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (11) |  | (11) | (460) |
Continuous unrealized losses existing greater than 12 months, gross |  |  |  | (1,111) |
Total, gross | (11) |  | (11) | (1,571) |
Debt securities held to maturity, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  | 9,531 |
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  | 9,538 |
Total, gross |  |  |  | 19,069 |
Debt securities held to maturity, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  | (33) |
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  | (54) |
Total, gross |  |  |  | (87) |
Commercial mortgage-backed securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 137,733 |  | 137,733 | 2,003 |
Gross Unrealized Gains | 1,700 |  | 1,700 |  |
Gross Unrealized Losses | (146) |  | (146) | (61) |
Fair Value | 139,287 |  | 139,287 | 1,942 |
Debt securities held to maturity |  |  |  |  |
Amortized Cost |  |  |  | 59,054 |
Gross Unrealized Gains |  |  |  | 11 |
Gross Unrealized Losses |  |  |  | (1,003) |
Fair Value |  |  |  | 58,062 |
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 137,733 |  | 137,733 | 2,003 |
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 139,287 |  | 139,287 | 1,942 |
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 33,322 |  | 33,322 |  |
Continuous unrealized losses existing for greater than 12 months, gross | 2,044 |  | 2,044 | 1,942 |
Total, gross | 35,366 |  | 35,366 | 1,942 |
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (144) |  | (144) |  |
Continuous unrealized losses existing greater than 12 months, gross | (2) |  | (2) | (61) |
Total, gross | (146) |  | (146) | (61) |
Debt securities held to maturity, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  | 12,067 |
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  | 45,041 |
Total, gross |  |  |  | 57,108 |
Debt securities held to maturity, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  | (212) |
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  | (791) |
Total, gross |  |  |  | (1,003) |
Residential mortgage-backed securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 912,308 |  | 912,308 | 322,646 |
Gross Unrealized Gains | 10,282 |  | 10,282 | 245 |
Gross Unrealized Losses | (624) |  | (624) | (7,143) |
Fair Value | 921,966 |  | 921,966 | 315,748 |
Debt securities held to maturity |  |  |  |  |
Amortized Cost |  |  |  | 515,659 |
Gross Unrealized Gains |  |  |  | 1,748 |
Gross Unrealized Losses |  |  |  | (6,037) |
Fair Value |  |  |  | 511,370 |
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 912,308 |  | 912,308 | 322,646 |
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 921,966 |  | 921,966 | 315,748 |
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 78,326 |  | 78,326 | 48,387 |
Continuous unrealized losses existing for greater than 12 months, gross | 50,259 |  | 50,259 | 247,573 |
Total, gross | 128,585 |  | 128,585 | 295,960 |
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (245) |  | (245) | (496) |
Continuous unrealized losses existing greater than 12 months, gross | (379) |  | (379) | (6,647) |
Total, gross | (624) |  | (624) | (7,143) |
Debt securities held to maturity, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  | 77,071 |
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  | 245,128 |
Total, gross |  |  |  | 322,199 |
Debt securities held to maturity, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  | (974) |
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  | (5,063) |
Total, gross |  |  |  | (6,037) |
Corporate debt securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 102,696 |  | 102,696 | 132,513 |
Gross Unrealized Gains | 1,280 |  | 1,280 | 61 |
Gross Unrealized Losses |  |  |  | (376) |
Fair Value | 103,976 |  | 103,976 | 132,198 |
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 102,696 |  | 102,696 | 132,513 |
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 103,976 |  | 103,976 | 132,198 |
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  | 90,713 |
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  | 15,083 |
Total, gross |  |  |  | 105,796 |
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  | (268) |
Continuous unrealized losses existing greater than 12 months, gross |  |  |  | (108) |
Total, gross |  |  |  | $ (376) |
Accounting Standards Update 2017-12 |  |  |  |  |
Realized gains and losses related to sales and calls of securities AFS |  |  |  |  |
Transferred securities from held to maturity to available-for-sale |  | $ 573,600 | $ 0 |  |
Unrealized loss related to transfer of securities from held to maturity to AFS |  | $ 4,800 |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |
Realized gains and losses related to sales and calls of securities AFS |  |  |  |  |
Transferred securities from held to maturity to available-for-sale | 15,400 |  |  |  |
Unrealized gain in fair value | $ 200 |  |  |  |

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