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Securities - General Disclosures (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Debt Securities |  |  |  |  |
Equity securities consisting of common stock and money market mutual funds, fair value | $ 5,126,000 |  | $ 5,126,000 |  | $ 5,952,000
Unrealized gains (losses) recognized on equity securities | 190,000 | $ (1,016,000) | (797,000) | $ (800,000) |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 1,641,429,000 |  | 1,641,429,000 |  | 1,627,065,000
Gross Unrealized Gains | 55,695,000 |  | 55,695,000 |  | 22,021,000
Gross Unrealized Losses | (258,000) |  | (258,000) |  | (829,000)
Fair Value | 1,696,866,000 |  | 1,696,866,000 |  | 1,648,257,000
Debt securities available for sale, Amortized Cost |  |  |  |  |
Due in one year or less | 132,192,000 |  | 132,192,000 |  |
Due after one year through five years | 241,337,000 |  | 241,337,000 |  |
Due after five years through ten years | 241,496,000 |  | 241,496,000 |  |
Due after ten years | 1,026,404,000 |  | 1,026,404,000 |  |
Amortized Cost | 1,641,429,000 |  | 1,641,429,000 |  | 1,627,065,000
Debt securities available for sale, Fair Value |  |  |  |  |
Due in one year or less | 133,749,000 |  | 133,749,000 |  |
Due after one year through five years | 250,413,000 |  | 250,413,000 |  |
Due after five years through ten years | 252,566,000 |  | 252,566,000 |  |
Due after ten years | 1,060,138,000 |  | 1,060,138,000 |  |
Fair Value | 1,696,866,000 |  | 1,696,866,000 |  | 1,648,257,000
Realized gains and losses related to sales and calls of securities AFS |  |  |  |  |
Gross security gains | 146,000 | 391,000 | 1,707,000 | 391,000 |
Gross security (losses) | (3,000) | (400,000) | (8,000) | (583,000) |
Net gains (losses) on sales of securities | 143,000 | $ (9,000) | 1,699,000 | $ (192,000) |
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 57,095,000 |  | 57,095,000 |  | 122,991,000
Continuous unrealized losses existing for greater than 12 months, gross | 937,000 |  | 937,000 |  | 53,851,000
Total, gross | 58,032,000 |  | 58,032,000 |  | 176,842,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (254,000) |  | (254,000) |  | (448,000)
Continuous unrealized losses existing greater than 12 months, gross | (4,000) |  | (4,000) |  | (381,000)
Total, gross | $ (258,000) |  | $ (258,000) |  | (829,000)
Security portfolio evaluated for other-than-temporary impairment | 1,106 |  | 1,106 |  |
Number of securities in unrealized loss position | 24 |  | 24 |  |
Securities in unrealized loss position as a percentage of aggregate carrying value of investments | 0.45% |  | 0.45% |  |
Collateral |  |  |  |  |
Realized gains and losses related to sales and calls of securities AFS |  |  |  |  |
Carrying amount of investment securities pledged as collateral | $ 638,100,000 |  | $ 638,100,000 |  | 704,400,000
U.S. Treasury securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 32,597,000 |  | 32,597,000 |  | 51,472,000
Gross Unrealized Gains | 639,000 |  | 639,000 |  | 265,000
Fair Value | 33,236,000 |  | 33,236,000 |  | 51,737,000
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 32,597,000 |  | 32,597,000 |  | 51,472,000
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 33,236,000 |  | 33,236,000 |  | 51,737,000
Obligations of U.S. government corporations and agencies |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 77,349,000 |  | 77,349,000 |  | 160,364,000
Gross Unrealized Gains | 2,752,000 |  | 2,752,000 |  | 2,684,000
Gross Unrealized Losses | (57,000) |  | (57,000) |  | (48,000)
Fair Value | 80,044,000 |  | 80,044,000 |  | 163,000,000
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 77,349,000 |  | 77,349,000 |  | 160,364,000
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 80,044,000 |  | 80,044,000 |  | 163,000,000
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 5,648,000 |  | 5,648,000 |  | 6,362,000
Total, gross | 5,648,000 |  | 5,648,000 |  | 6,362,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (57,000) |  | (57,000) |  | (48,000)
Total, gross | (57,000) |  | (57,000) |  | (48,000)
Obligations of states and political subdivisions |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 272,885,000 |  | 272,885,000 |  | 262,492,000
Gross Unrealized Gains | 10,047,000 |  | 10,047,000 |  | 5,810,000
Gross Unrealized Losses | (38,000) |  | (38,000) |  | (11,000)
Fair Value | 282,894,000 |  | 282,894,000 |  | 268,291,000
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 272,885,000 |  | 272,885,000 |  | 262,492,000
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 282,894,000 |  | 282,894,000 |  | 268,291,000
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 6,432,000 |  | 6,432,000 |  | 4,981,000
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  |  | 1,548,000
Total, gross | 6,432,000 |  | 6,432,000 |  | 6,529,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (38,000) |  | (38,000) |  | (11,000)
Total, gross | (38,000) |  | (38,000) |  | (11,000)
Commercial mortgage-backed securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 230,352,000 |  | 230,352,000 |  | 137,733,000
Gross Unrealized Gains | 10,956,000 |  | 10,956,000 |  | 1,700,000
Gross Unrealized Losses | (3,000) |  | (3,000) |  | (146,000)
Fair Value | 241,305,000 |  | 241,305,000 |  | 139,287,000
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 230,352,000 |  | 230,352,000 |  | 137,733,000
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 241,305,000 |  | 241,305,000 |  | 139,287,000
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 4,963,000 |  | 4,963,000 |  | 33,322,000
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  |  | 2,044,000
Total, gross | 4,963,000 |  | 4,963,000 |  | 35,366,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (3,000) |  | (3,000) |  | (144,000)
Continuous unrealized losses existing greater than 12 months, gross |  |  |  |  | (2,000)
Total, gross | (3,000) |  | (3,000) |  | (146,000)
Residential mortgage-backed securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 940,842,000 |  | 940,842,000 |  | 912,308,000
Gross Unrealized Gains | 29,475,000 |  | 29,475,000 |  | 10,282,000
Gross Unrealized Losses | (124,000) |  | (124,000) |  | (624,000)
Fair Value | 970,193,000 |  | 970,193,000 |  | 921,966,000
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 940,842,000 |  | 940,842,000 |  | 912,308,000
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 970,193,000 |  | 970,193,000 |  | 921,966,000
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 35,830,000 |  | 35,830,000 |  | 78,326,000
Continuous unrealized losses existing for greater than 12 months, gross | 937,000 |  | 937,000 |  | 50,259,000
Total, gross | 36,767,000 |  | 36,767,000 |  | 128,585,000
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (120,000) |  | (120,000) |  | (245,000)
Continuous unrealized losses existing greater than 12 months, gross | (4,000) |  | (4,000) |  | (379,000)
Total, gross | (124,000) |  | (124,000) |  | (624,000)
Corporate debt securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 87,404,000 |  | 87,404,000 |  | 102,696,000
Gross Unrealized Gains | 1,826,000 |  | 1,826,000 |  | 1,280,000
Gross Unrealized Losses | (36,000) |  | (36,000) |  |
Fair Value | 89,194,000 |  | 89,194,000 |  | 103,976,000
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 87,404,000 |  | 87,404,000 |  | 102,696,000
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 89,194,000 |  | 89,194,000 |  | $ 103,976,000
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 4,222,000 |  | 4,222,000 |  |
Total, gross | 4,222,000 |  | 4,222,000 |  |
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (36,000) |  | (36,000) |  |
Total, gross | $ (36,000) |  | $ (36,000) |  |

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