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Available for Sale and Held to Maturity securities (Details 1) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale and Held-to-maturity | $ 1,046,392 | $ 941,692
Available-for-sale Securities: |  |
Amortized Cost | 450,548 | 448,219
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 1,233 | 3,740
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (9,029) | (4,461)
Equity Securities, FV-NI | 442,752 | 447,498
Debt Securities, Available-for-sale, Amortized Cost | 450,548 |
Amortized Cost | 611,490 | 497,688
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 2,533 | 2,429
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (10,383) | (5,923)
Fair Value | 603,640 | 494,194
Available for Sale Securities and Held to Maturity Securities Amortized Cost | 1,062,038 | 945,907
Available for Sale Securities and Held to Maturity Securities Gross Unrealized Gains | 3,766 | 6,169
Available for Sale Securities and Held to Maturity Securities Gross Unrealized Losses | (19,412) | (10,384)
U.S. Government agency securities |  |
Available-for-sale Securities: |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 86
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (439) | (131)
Equity Securities, FV-NI | 32,038 | 35,430
Debt Securities, Available-for-sale, Amortized Cost | 32,477 | 35,475
U.S. treasury securities [Member] |  |
Available-for-sale Securities: |  |
Amortized Cost | 1,004 | 1,006
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 11 | 29
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Fair Value | 1,015 | 1,035
Agency mortgage-backed securities [Member] |  |
Available-for-sale Securities: |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,020 | 1,897
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (3,406) | (1,067)
Equity Securities, FV-NI | 220,105 | 215,764
Debt Securities, Available-for-sale, Amortized Cost | 222,491 | 214,934
Amortized Cost | 252,484 | 204,768
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1,548 | 1,791
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (3,104) | (736)
Fair Value | 250,928 | 205,823
Agency collateralized mortgage obligations [Member] |  |
Available-for-sale Securities: |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 197 | 78
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (3,435) | (2,164)
Equity Securities, FV-NI | 134,911 | 122,012
Debt Securities, Available-for-sale, Amortized Cost | 138,149 | 124,098
Amortized Cost | 332,775 | 262,998
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 869 | 397
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (6,920) | (4,987)
Fair Value | 326,724 | 258,408
State, county, and municipal securities [Member] |  |
Available-for-sale Securities: |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 16 | 37
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Equity Securities, FV-NI | 1,735 | 2,274
Debt Securities, Available-for-sale, Amortized Cost | 1,719 | 2,237
Amortized Cost | 0 |
Fair Value | 0 |
Single issuer trust preferred securities issued by banks [Member] |  |
Available-for-sale Securities: |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (10) | 0
Equity Securities, FV-NI | 707 | 2,016
Debt Securities, Available-for-sale, Amortized Cost | 717 | 2,012
Amortized Cost | 1,500 | 1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 29
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (10) | 0
Fair Value | 1,490 | 1,529
Pooled trust preferred securities issued by banks and insurers |  |
Available-for-sale Securities: |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (349) | (539)
Equity Securities, FV-NI | 1,329 | 1,640
Debt Securities, Available-for-sale, Amortized Cost | 1,678 | 2,179
Small Business Administration Pooled Securities [Member] |  |
Available-for-sale Securities: |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 44
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1,390) | (118)
Equity Securities, FV-NI | 51,927 | 47,778
Debt Securities, Available-for-sale, Amortized Cost | 53,317 | 47,852
Amortized Cost | 23,727 | 27,416
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 105 | 183
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (349) | (200)
Fair Value | 23,483 | 27,399
Marketable securities [Member] |  |
Available-for-sale Securities: |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 1,594
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | (442)
Equity Securities, FV-NI | 0 | 20,584
Debt Securities, Available-for-sale, Amortized Cost | $ 0 | $ 19,432

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