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Securities, Held to Maturity (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) Position | Jun. 30, 2017 USD ($) Position | Dec. 31, 2016 USD ($) Position | Jun. 30, 2016 USD ($)
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized cost | $ 515,628 | $ 515,628 | $ 527,948 |
Unrealized gains | 3,507 | 3,507 | 1,581 |
Unrealized losses | 2,479 | 2,479 | 4,479 |
Estimated fair value | 516,656 | 516,656 | 525,050 |
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Less than 12 months | 117,750 | 117,750 | 286,063 |
12 months or longer | 35,657 | 35,657 | 35,209 |
Total | 153,407 | 153,407 | 321,272 |
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |
Less than 12 months | (1,423) | (1,423) | (3,290) |
12 months or longer | (1,056) | (1,056) | (1,189) |
Total | $ (2,479) | $ (2,479) | $ (4,479) |
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |
Less than 12 months | Position | 46 | 46 | 172 |
12 months or longer | Position | 9 | 9 | 4 |
Total | Position | 55 | 55 | 176 |
Held-to-maturity securities sold, amortized cost | $ 800 | $ 800 |  | $ 0
Held-to-maturity securities sold, unrealized loss | (2) | (2) |  |
Amortized costs of securities held to maturity pledged to secure public deposits | 1,500,000 | 1,500,000 | $ 1,500,000 |
Amortized costs of securities held to maturity pledged as collateral for repurchase agreements | 234,400 | 234,400 | 235,600 |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |
Within one year | 34,486 | 34,486 |  |
From one to five years | 38,026 | 38,026 |  |
From five to ten years | 122,400 | 122,400 |  |
After ten years | 320,716 | 320,716 |  |
Amortized cost | 515,628 | 515,628 | 527,948 |
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |
Within one year | 34,493 | 34,493 |  |
From one to five years | 38,392 | 38,392 |  |
From five to ten years | 123,545 | 123,545 |  |
After ten years | 320,226 | 320,226 |  |
Fair value | 516,656 | 516,656 | 525,050 |
Mortgage-Backed [Member] |  |  |  |
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Less than 12 months | 52,892 | 52,892 | 95,492 |
12 months or longer | 0 | 0 | 0 |
Total | 52,892 | 52,892 | 95,492 |
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |
Less than 12 months | (878) | (878) | (1,176) |
12 months or longer | 0 | 0 | 0 |
Total | $ (878) | $ (878) | $ (1,176) |
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |
Less than 12 months | Position | 4 | 4 | 5 |
12 months or longer | Position | 0 | 0 | 0 |
Total | Position | 4 | 4 | 5 |
Mortgage-Backed, Government Sponsored Enterprises [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized cost | $ 102,651 | $ 102,651 | $ 96,668 |
Unrealized gains | 61 | 61 | 0 |
Unrealized losses | 878 | 878 | 1,176 |
Estimated fair value | 101,834 | 101,834 | 95,492 |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized cost | 102,651 | 102,651 | 96,668 |
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |
Fair value | 101,834 | 101,834 | 95,492 |
Mortgage-Backed, U.S. Government Agency Securities [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized cost | 474 | 474 | 533 |
Unrealized gains | 69 | 69 | 87 |
Unrealized losses | 0 | 0 | 0 |
Estimated fair value | 543 | 543 | 620 |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized cost | 474 | 474 | 533 |
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |
Fair value | 543 | 543 | 620 |
Collateralized Mortgage Obligations [Member] |  |  |  |
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Less than 12 months | 40,458 | 40,458 | 108,587 |
12 months or longer | 32,969 | 32,969 | 35,209 |
Total | 73,427 | 73,427 | 143,796 |
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |
Less than 12 months | (148) | (148) | (319) |
12 months or longer | (920) | (920) | (1,189) |
Total | $ (1,068) | $ (1,068) | $ (1,508) |
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |
Less than 12 months | Position | 6 | 6 | 12 |
12 months or longer | Position | 4 | 4 | 4 |
Total | Position | 10 | 10 | 16 |
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized cost | $ 205,806 | $ 205,806 | $ 225,213 |
Unrealized gains | 1,280 | 1,280 | 1,060 |
Unrealized losses | 1,068 | 1,068 | 1,508 |
Estimated fair value | 206,018 | 206,018 | 224,765 |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized cost | 205,806 | 205,806 | 225,213 |
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |
Fair value | 206,018 | 206,018 | 224,765 |
State & Municipal [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized cost | 206,697 | 206,697 | 205,534 |
Unrealized gains | 2,097 | 2,097 | 434 |
Unrealized losses | 533 | 533 | 1,795 |
Estimated fair value | 208,261 | 208,261 | 204,173 |
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Less than 12 months | 24,400 | 24,400 | 81,984 |
12 months or longer | 2,688 | 2,688 | 0 |
Total | 27,088 | 27,088 | 81,984 |
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |
Less than 12 months | (397) | (397) | (1,795) |
12 months or longer | (136) | (136) | 0 |
Total | $ (533) | $ (533) | $ (1,795) |
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |
Less than 12 months | Position | 36 | 36 | 155 |
12 months or longer | Position | 5 | 5 | 0 |
Total | Position | 41 | 41 | 155 |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized cost | $ 206,697 | $ 206,697 | $ 205,534 |
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |
Fair value | $ 208,261 | $ 208,261 | $ 204,173 |

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