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Securities - General Disclosures (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Debt Securities |  |  |  |  |
Equity securities consisting of common stock and money market mutual funds, fair value | $ 17,808,000 |  | $ 17,808,000 |  | $ 5,952,000
Unrealized gains (losses) recognized on equity securities | (437,000) | $ 65,000 | (1,234,000) | $ (735,000) |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 2,027,816,000 |  | 2,027,816,000 |  | 1,627,065,000
Gross Unrealized Gains | 53,509,000 |  | 53,509,000 |  | 22,021,000
Gross Unrealized Losses | (476,000) |  | (476,000) |  | (829,000)
Fair Value | 2,080,849,000 |  | 2,080,849,000 |  | 1,648,257,000
Debt securities available for sale, Amortized Cost |  |  |  |  |
Due in one year or less | 148,312,000 |  | 148,312,000 |  |
Due after one year through five years | 210,254,000 |  | 210,254,000 |  |
Due after five years through ten years | 260,947,000 |  | 260,947,000 |  |
Due after ten years | 1,408,303,000 |  | 1,408,303,000 |  |
Amortized Cost | 2,027,816,000 |  | 2,027,816,000 |  | 1,627,065,000
Debt securities available for sale, Fair Value |  |  |  |  |
Due in one year or less | 149,872,000 |  | 149,872,000 |  |
Due after one year through five years | 219,106,000 |  | 219,106,000 |  |
Due after five years through ten years | 272,794,000 |  | 272,794,000 |  |
Due after ten years | 1,439,077,000 |  | 1,439,077,000 |  |
Fair Value | 2,080,849,000 |  | 2,080,849,000 |  | 1,648,257,000
Realized gains and losses related to sales and calls of securities AFS |  |  |  |  |
Gross security gains | 11,000 | 298,000 | 1,718,000 | 689,000 |
Gross security (losses) |  | (1,000) | (8,000) | (585,000) |
Net gains (losses) on sales of securities | 11,000 | $ 297,000 | 1,710,000 | $ 104,000 |
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 217,361,000 |  | 217,361,000 |  | 122,991,000
Continuous unrealized losses existing for greater than 12 months, gross | 6,317,000 |  | 6,317,000 |  | 53,851,000
Total, gross | 223,678,000 |  | 223,678,000 |  | 176,842,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (418,000) |  | (418,000) |  | (448,000)
Continuous unrealized losses existing greater than 12 months, gross | (58,000) |  | (58,000) |  | (381,000)
Total, gross | $ (476,000) |  | $ (476,000) |  | (829,000)
Security portfolio evaluated for other-than-temporary impairment | 1,190 |  | 1,190 |  |
Number of securities in unrealized loss position | 37 |  | 37 |  |
Securities in unrealized loss position as a percentage of aggregate carrying value of investments | 0.21% |  | 0.21% |  |
Collateral |  |  |  |  |
Realized gains and losses related to sales and calls of securities AFS |  |  |  |  |
Carrying amount of investment securities pledged as collateral | $ 591,700,000 |  | $ 591,700,000 |  | 704,400,000
U.S. Treasury securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 29,442,000 |  | 29,442,000 |  | 51,472,000
Gross Unrealized Gains | 495,000 |  | 495,000 |  | 265,000
Fair Value | 29,937,000 |  | 29,937,000 |  | 51,737,000
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 29,442,000 |  | 29,442,000 |  | 51,472,000
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 29,937,000 |  | 29,937,000 |  | 51,737,000
Obligations of U.S. government corporations and agencies |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 76,021,000 |  | 76,021,000 |  | 160,364,000
Gross Unrealized Gains | 2,512,000 |  | 2,512,000 |  | 2,684,000
Gross Unrealized Losses | (55,000) |  | (55,000) |  | (48,000)
Fair Value | 78,478,000 |  | 78,478,000 |  | 163,000,000
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 76,021,000 |  | 76,021,000 |  | 160,364,000
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 78,478,000 |  | 78,478,000 |  | 163,000,000
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  |  | 6,362,000
Continuous unrealized losses existing for greater than 12 months, gross | 5,479,000 |  | 5,479,000 |  |
Total, gross | 5,479,000 |  | 5,479,000 |  | 6,362,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross |  |  |  |  | (48,000)
Continuous unrealized losses existing greater than 12 months, gross | (55,000) |  | (55,000) |  |
Total, gross | (55,000) |  | (55,000) |  | (48,000)
Obligations of states and political subdivisions |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 304,749,000 |  | 304,749,000 |  | 262,492,000
Gross Unrealized Gains | 11,380,000 |  | 11,380,000 |  | 5,810,000
Gross Unrealized Losses | (9,000) |  | (9,000) |  | (11,000)
Fair Value | 316,120,000 |  | 316,120,000 |  | 268,291,000
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 304,749,000 |  | 304,749,000 |  | 262,492,000
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 316,120,000 |  | 316,120,000 |  | 268,291,000
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 3,810,000 |  | 3,810,000 |  | 4,981,000
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  |  | 1,548,000
Total, gross | 3,810,000 |  | 3,810,000 |  | 6,529,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (9,000) |  | (9,000) |  | (11,000)
Total, gross | (9,000) |  | (9,000) |  | (11,000)
Commercial mortgage-backed securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 346,543,000 |  | 346,543,000 |  | 137,733,000
Gross Unrealized Gains | 10,804,000 |  | 10,804,000 |  | 1,700,000
Gross Unrealized Losses | (104,000) |  | (104,000) |  | (146,000)
Fair Value | 357,243,000 |  | 357,243,000 |  | 139,287,000
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 346,543,000 |  | 346,543,000 |  | 137,733,000
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 357,243,000 |  | 357,243,000 |  | 139,287,000
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 53,690,000 |  | 53,690,000 |  | 33,322,000
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  |  | 2,044,000
Total, gross | 53,690,000 |  | 53,690,000 |  | 35,366,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (104,000) |  | (104,000) |  | (144,000)
Continuous unrealized losses existing greater than 12 months, gross |  |  |  |  | (2,000)
Total, gross | (104,000) |  | (104,000) |  | (146,000)
Residential mortgage-backed securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 1,192,131,000 |  | 1,192,131,000 |  | 912,308,000
Gross Unrealized Gains | 26,699,000 |  | 26,699,000 |  | 10,282,000
Gross Unrealized Losses | (304,000) |  | (304,000) |  | (624,000)
Fair Value | 1,218,526,000 |  | 1,218,526,000 |  | 921,966,000
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 1,192,131,000 |  | 1,192,131,000 |  | 912,308,000
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 1,218,526,000 |  | 1,218,526,000 |  | 921,966,000
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 152,298,000 |  | 152,298,000 |  | 78,326,000
Continuous unrealized losses existing for greater than 12 months, gross | 838,000 |  | 838,000 |  | 50,259,000
Total, gross | 153,136,000 |  | 153,136,000 |  | 128,585,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (301,000) |  | (301,000) |  | (245,000)
Continuous unrealized losses existing greater than 12 months, gross | (3,000) |  | (3,000) |  | (379,000)
Total, gross | (304,000) |  | (304,000) |  | (624,000)
Corporate debt securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 78,930,000 |  | 78,930,000 |  | 102,696,000
Gross Unrealized Gains | 1,619,000 |  | 1,619,000 |  | 1,280,000
Gross Unrealized Losses | (4,000) |  | (4,000) |  |
Fair Value | 80,545,000 |  | 80,545,000 |  | 103,976,000
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 78,930,000 |  | 78,930,000 |  | 102,696,000
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 80,545,000 |  | 80,545,000 |  | $ 103,976,000
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 7,563,000 |  | 7,563,000 |  |
Total, gross | 7,563,000 |  | 7,563,000 |  |
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (4,000) |  | (4,000) |  |
Total, gross | $ (4,000) |  | $ (4,000) |  |

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