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Securities - General Disclosures (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Securities |  |  |  |  |  |
Equity securities consisting of common stock and money market mutual funds, fair value | $ 5,362,000 |  |  | $ 5,362,000 |  | $ 6,169,000
Unrealized (losses) gains recognized on equity securities | (1,016,000) |  |  | (800,000) |  |
Debt securities available for sale |  |  |  |  |  |
Amortized Cost | 1,827,614,000 |  |  | 1,827,614,000 |  | 707,213,000
Gross Unrealized Gains | 21,899,000 |  |  | 21,899,000 |  | 798,000
Gross Unrealized Losses | (1,440,000) |  |  | (1,440,000) |  | (10,326,000)
Fair Value | 1,848,073,000 |  |  | 1,848,073,000 |  | 697,685,000
Debt securities held to maturity |  |  |  |  |  |
Amortized Cost | 15,708,000 |  |  | 15,708,000 |  | 608,660,000
Gross Unrealized Gains |  |  |  |  |  | 1,827,000
Gross Unrealized Losses |  |  |  |  |  | (7,127,000)
Fair Value | 15,934,000 |  |  | 15,934,000 |  | 603,360,000
Debt securities available for sale, Amortized Cost |  |  |  |  |  |
Due in one year or less | 220,023,000 |  |  | 220,023,000 |  |
Due after one year through five years | 418,649,000 |  |  | 418,649,000 |  |
Due after five years through ten years | 263,388,000 |  |  | 263,388,000 |  |
Due after ten years | 925,554,000 |  |  | 925,554,000 |  |
Amortized Cost | 1,827,614,000 |  |  | 1,827,614,000 |  | 707,213,000
Debt securities available for sale, Fair Value |  |  |  |  |  |
Due in one year or less | 220,304,000 |  |  | 220,304,000 |  |
Due after one year through five years | 424,241,000 |  |  | 424,241,000 |  |
Due after five years through ten years | 267,989,000 |  |  | 267,989,000 |  |
Due after ten years | 935,539,000 |  |  | 935,539,000 |  |
Fair Value | 1,848,073,000 |  |  | 1,848,073,000 |  | 697,685,000
Debt securities held to maturity, Amortized Cost |  |  |  |  |  |
Due in one year or less | 2,724,000 |  |  | 2,724,000 |  |
Due after one year through five years | 11,861,000 |  |  | 11,861,000 |  |
Due after five years through ten years | 1,123,000 |  |  | 1,123,000 |  |
Amortized Cost | 15,708,000 |  |  | 15,708,000 |  | 608,660,000
Debt securities held to maturity, Fair Value |  |  |  |  |  |
Due in one year or less | 2,729,000 |  |  | 2,729,000 |  |
Due after one year through five years | 12,035,000 |  |  | 12,035,000 |  |
Due after five years through ten years | 1,170,000 |  |  | 1,170,000 |  |
Fair Value | 15,934,000 |  |  | 15,934,000 |  | 603,360,000
Realized gains and losses related to sales and calls of securities AFS |  |  |  |  |  |
Gross security gains | 391,000 |  |  | 391,000 |  |
Gross security (losses) | (401,000) |  |  | (584,000) |  |
Security gains (losses), net | (10,000) |  |  | (193,000) |  |
Debt securities available for sale, Fair Value |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 16,839,000 |  |  | 16,839,000 |  | 190,737,000
Continuous unrealized losses existing for greater than 12 months, gross | 284,775,000 |  |  | 284,775,000 |  | 417,336,000
Total, gross | 301,614,000 |  |  | 301,614,000 |  | 608,073,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (23,000) |  |  | (23,000) |  | (1,231,000)
Continuous unrealized losses existing greater than 12 months, gross | (1,417,000) |  |  | (1,417,000) |  | (9,095,000)
Total, gross | $ (1,440,000) |  |  | $ (1,440,000) |  | (10,326,000)
Debt securities held to maturity, Fair Value |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  |  |  | 98,669,000
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  |  |  | 299,707,000
Total, gross |  |  |  |  |  | 398,376,000
Debt securities held to maturity, Unrealized Losses |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  |  |  | (1,219,000)
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  |  |  | (5,908,000)
Total, gross |  |  |  |  |  | (7,127,000)
Security portfolio evaluated for other-than-temporary impairment | 1,273 |  |  | 1,273 |  |
Number of securities in unrealized loss position | 126 |  |  | 126 |  |
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 | $ 755,100,000 |  |  | $ 755,100,000 |  | 498,300,000
U.S. Treasury securities |  |  |  |  |  |
Debt securities available for sale |  |  |  |  |  |
Amortized Cost | 58,308,000 |  |  | 58,308,000 |  | 25,824,000
Gross Unrealized Gains | 260,000 |  |  | 260,000 |  | 1,000
Gross Unrealized Losses | (33,000) |  |  | (33,000) |  | (414,000)
Fair Value | 58,535,000 |  |  | 58,535,000 |  | 25,411,000
Debt securities available for sale, Amortized Cost |  |  |  |  |  |
Amortized Cost | 58,308,000 |  |  | 58,308,000 |  | 25,824,000
Debt securities available for sale, Fair Value |  |  |  |  |  |
Fair Value | 58,535,000 |  |  | 58,535,000 |  | 25,411,000
Debt securities available for sale, Fair Value |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  |  |  | 995,000
Continuous unrealized losses existing for greater than 12 months, gross | 24,768,000 |  |  | 24,768,000 |  | 24,343,000
Total, gross | 24,768,000 |  |  | 24,768,000 |  | 25,338,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  |  |  | (4,000)
Continuous unrealized losses existing greater than 12 months, gross | (33,000) |  |  | (33,000) |  | (410,000)
Total, gross | (33,000) |  |  | (33,000) |  | (414,000)
Obligations of U.S. government corporations and agencies |  |  |  |  |  |
Debt securities available for sale |  |  |  |  |  |
Amortized Cost | 287,444,000 |  |  | 287,444,000 |  | 53,096,000
Gross Unrealized Gains | 3,370,000 |  |  | 3,370,000 |  | 7,000
Gross Unrealized Losses | (48,000) |  |  | (48,000) |  | (761,000)
Fair Value | 290,766,000 |  |  | 290,766,000 |  | 52,342,000
Debt securities available for sale, Amortized Cost |  |  |  |  |  |
Amortized Cost | 287,444,000 |  |  | 287,444,000 |  | 53,096,000
Debt securities available for sale, Fair Value |  |  |  |  |  |
Fair Value | 290,766,000 |  |  | 290,766,000 |  | 52,342,000
Debt securities available for sale, Fair Value |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 51,000 |  |  | 51,000 |  | 749,000
Continuous unrealized losses existing for greater than 12 months, gross | 22,468,000 |  |  | 22,468,000 |  | 50,744,000
Total, gross | 22,519,000 |  |  | 22,519,000 |  | 51,493,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  |  |  | (3,000)
Continuous unrealized losses existing greater than 12 months, gross | (48,000) |  |  | (48,000) |  | (758,000)
Total, gross | (48,000) |  |  | (48,000) |  | (761,000)
Obligations of states and political subdivisions |  |  |  |  |  |
Debt securities available for sale |  |  |  |  |  |
Amortized Cost | 274,301,000 |  |  | 274,301,000 |  | 171,131,000
Gross Unrealized Gains | 4,683,000 |  |  | 4,683,000 |  | 484,000
Gross Unrealized Losses | (54,000) |  |  | (54,000) |  | (1,571,000)
Fair Value | 278,930,000 |  |  | 278,930,000 |  | 170,044,000
Debt securities held to maturity |  |  |  |  |  |
Amortized Cost | 15,708,000 | [1] |  | 15,708,000 | [1] | 33,947,000
Gross Unrealized Gains | 226,000 | [1] |  | 226,000 | [1] | 68,000
Gross Unrealized Losses |  |  |  |  |  | (87,000)
Fair Value | 15,934,000 | [1] |  | 15,934,000 | [1] | 33,928,000
Debt securities available for sale, Amortized Cost |  |  |  |  |  |
Amortized Cost | 274,301,000 |  |  | 274,301,000 |  | 171,131,000
Debt securities available for sale, Fair Value |  |  |  |  |  |
Fair Value | 278,930,000 |  |  | 278,930,000 |  | 170,044,000
Debt securities held to maturity, Amortized Cost |  |  |  |  |  |
Amortized Cost | 15,708,000 | [1] |  | 15,708,000 | [1] | 33,947,000
Debt securities held to maturity, Fair Value |  |  |  |  |  |
Fair Value | 15,934,000 | [1] |  | 15,934,000 | [1] | 33,928,000
Debt securities available for sale, Fair Value |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 1,394,000 |  |  | 1,394,000 |  | 49,893,000
Continuous unrealized losses existing for greater than 12 months, gross | 24,192,000 |  |  | 24,192,000 |  | 77,651,000
Total, gross | 25,586,000 |  |  | 25,586,000 |  | 127,544,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (8,000) |  |  | (8,000) |  | (460,000)
Continuous unrealized losses existing greater than 12 months, gross | (46,000) |  |  | (46,000) |  | (1,111,000)
Total, gross | (54,000) |  |  | (54,000) |  | (1,571,000)
Debt securities held to maturity, Fair Value |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  |  |  | 9,531,000
Continuous unrealized losses existing for greater than 12 months, gross | 500,000 |  |  | 500,000 |  | 9,538,000
Total, gross | 500,000 |  |  | 500,000 |  | 19,069,000
Debt securities held to maturity, Unrealized Losses |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  |  |  | (33,000)
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  |  |  | (54,000)
Total, gross |  |  |  |  |  | (87,000)
Commercial mortgage-backed securities |  |  |  |  |  |
Debt securities available for sale |  |  |  |  |  |
Amortized Cost | 122,510,000 |  |  | 122,510,000 |  | 2,003,000
Gross Unrealized Gains | 1,678,000 |  |  | 1,678,000 |  |
Gross Unrealized Losses | (33,000) |  |  | (33,000) |  | (61,000)
Fair Value | 124,155,000 |  |  | 124,155,000 |  | 1,942,000
Debt securities held to maturity |  |  |  |  |  |
Amortized Cost |  |  |  |  |  | 59,054,000
Gross Unrealized Gains |  |  |  |  |  | 11,000
Gross Unrealized Losses |  |  |  |  |  | (1,003,000)
Fair Value |  |  |  |  |  | 58,062,000
Debt securities available for sale, Amortized Cost |  |  |  |  |  |
Amortized Cost | 122,510,000 |  |  | 122,510,000 |  | 2,003,000
Debt securities available for sale, Fair Value |  |  |  |  |  |
Fair Value | 124,155,000 |  |  | 124,155,000 |  | 1,942,000
Debt securities held to maturity, Amortized Cost |  |  |  |  |  |
Amortized Cost |  |  |  |  |  | 59,054,000
Debt securities held to maturity, Fair Value |  |  |  |  |  |
Fair Value |  |  |  |  |  | 58,062,000
Debt securities available for sale, Fair Value |  |  |  |  |  |
Continuous unrealized losses existing for greater than 12 months, gross | 14,746,000 |  |  | 14,746,000 |  | 1,942,000
Total, gross | 14,746,000 |  |  | 14,746,000 |  | 1,942,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |  |
Continuous unrealized losses existing greater than 12 months, gross | (33,000) |  |  | (33,000) |  | (61,000)
Total, gross | (33,000) |  |  | (33,000) |  | (61,000)
Debt securities held to maturity, Fair Value |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  |  |  | 12,067,000
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  |  |  | 45,041,000
Total, gross |  |  |  |  |  | 57,108,000
Debt securities held to maturity, Unrealized Losses |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  |  |  | (212,000)
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  |  |  | (791,000)
Total, gross |  |  |  |  |  | (1,003,000)
Residential mortgage-backed securities |  |  |  |  |  |
Debt securities available for sale |  |  |  |  |  |
Amortized Cost | 951,998,000 |  |  | 951,998,000 |  | 322,646,000
Gross Unrealized Gains | 10,394,000 |  |  | 10,394,000 |  | 245,000
Gross Unrealized Losses | (1,255,000) |  |  | (1,255,000) |  | (7,143,000)
Fair Value | 961,137,000 |  |  | 961,137,000 |  | 315,748,000
Debt securities held to maturity |  |  |  |  |  |
Amortized Cost |  |  |  |  |  | 515,659,000
Gross Unrealized Gains |  |  |  |  |  | 1,748,000
Gross Unrealized Losses |  |  |  |  |  | (6,037,000)
Fair Value |  |  |  |  |  | 511,370,000
Debt securities available for sale, Amortized Cost |  |  |  |  |  |
Amortized Cost | 951,998,000 |  |  | 951,998,000 |  | 322,646,000
Debt securities available for sale, Fair Value |  |  |  |  |  |
Fair Value | 961,137,000 |  |  | 961,137,000 |  | 315,748,000
Debt securities held to maturity, Amortized Cost |  |  |  |  |  |
Amortized Cost |  |  |  |  |  | 515,659,000
Debt securities held to maturity, Fair Value |  |  |  |  |  |
Fair Value |  |  |  |  |  | 511,370,000
Debt securities available for sale, Fair Value |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 13,629,000 |  |  | 13,629,000 |  | 48,387,000
Continuous unrealized losses existing for greater than 12 months, gross | 183,552,000 |  |  | 183,552,000 |  | 247,573,000
Total, gross | 197,181,000 |  |  | 197,181,000 |  | 295,960,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (8,000) |  |  | (8,000) |  | (496,000)
Continuous unrealized losses existing greater than 12 months, gross | (1,247,000) |  |  | (1,247,000) |  | (6,647,000)
Total, gross | (1,255,000) |  |  | (1,255,000) |  | (7,143,000)
Debt securities held to maturity, Fair Value |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  |  |  | 77,071,000
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  |  |  | 245,128,000
Total, gross |  |  |  |  |  | 322,199,000
Debt securities held to maturity, Unrealized Losses |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  |  |  | (974,000)
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  |  |  | (5,063,000)
Total, gross |  |  |  |  |  | (6,037,000)
Corporate debt securities |  |  |  |  |  |
Debt securities available for sale |  |  |  |  |  |
Amortized Cost | 133,053,000 |  |  | 133,053,000 |  | 132,513,000
Gross Unrealized Gains | 1,514,000 |  |  | 1,514,000 |  | 61,000
Gross Unrealized Losses | (17,000) |  |  | (17,000) |  | (376,000)
Fair Value | 134,550,000 |  |  | 134,550,000 |  | 132,198,000
Debt securities available for sale, Amortized Cost |  |  |  |  |  |
Amortized Cost | 133,053,000 |  |  | 133,053,000 |  | 132,513,000
Debt securities available for sale, Fair Value |  |  |  |  |  |
Fair Value | 134,550,000 |  |  | 134,550,000 |  | 132,198,000
Debt securities available for sale, Fair Value |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 1,765,000 |  |  | 1,765,000 |  | 90,713,000
Continuous unrealized losses existing for greater than 12 months, gross | 15,049,000 |  |  | 15,049,000 |  | 15,083,000
Total, gross | 16,814,000 |  |  | 16,814,000 |  | 105,796,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (7,000) |  |  | (7,000) |  | (268,000)
Continuous unrealized losses existing greater than 12 months, gross | (10,000) |  |  | (10,000) |  | (108,000)
Total, gross | $ (17,000) |  |  | $ (17,000) |  | $ (376,000)
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 |  |  | $ 573,600,000 |  |  |
Unrealized loss related to transfer of securities from held to maturity to AFS |  |  | $ 4,800,000 |  |  |
[1] | Gross unrealized losses less than one thousand dollars.

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