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Securities, Held to Maturity (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) Position | Sep. 30, 2017 USD ($) Position | Dec. 31, 2016 USD ($) Position | Sep. 30, 2016 USD ($)
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized cost | $ 494,309 | $ 494,309 | $ 527,948 |
Unrealized gains | 3,424 | 3,424 | 1,581 |
Unrealized losses | 2,322 | 2,322 | 4,479 |
Estimated fair value | 495,411 | 495,411 | 525,050 |
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Less than 12 months | 117,371 | 117,371 | 286,063 |
12 months or longer | 44,218 | 44,218 | 35,209 |
Total | 161,589 | 161,589 | 321,272 |
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |
Less than 12 months | (1,033) | (1,033) | (3,290) |
12 months or longer | (1,289) | (1,289) | (1,189) |
Total | $ (2,322) | $ (2,322) | $ (4,479) |
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |
Less than 12 months | Position | 32 | 32 | 172 |
12 months or longer | Position | 25 | 25 | 4 |
Total | Position | 57 | 57 | 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 | 1,200,000 | 1,200,000 | $ 1,500,000 |
Amortized costs of securities held to maturity pledged as collateral for repurchase agreements | 242,600 | 242,600 | 235,600 |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |
Within one year | 28,489 | 28,489 |  |
From one to five years | 38,321 | 38,321 |  |
From five to ten years | 144,621 | 144,621 |  |
After ten years | 282,878 | 282,878 |  |
Amortized cost | 494,309 | 494,309 | 527,948 |
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |
Within one year | 28,493 | 28,493 |  |
From one to five years | 38,702 | 38,702 |  |
From five to ten years | 145,547 | 145,547 |  |
After ten years | 282,669 | 282,669 |  |
Fair value | 495,411 | 495,411 | 525,050 |
Mortgage-Backed [Member] |  |  |  |
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Less than 12 months | 51,166 | 51,166 | 95,492 |
12 months or longer | 0 | 0 | 0 |
Total | 51,166 | 51,166 | 95,492 |
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |
Less than 12 months | (685) | (685) | (1,176) |
12 months or longer | 0 | 0 | 0 |
Total | $ (685) | $ (685) | $ (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 | $ 99,502 | $ 99,502 | $ 96,668 |
Unrealized gains | 239 | 239 | 0 |
Unrealized losses | 685 | 685 | 1,176 |
Estimated fair value | 99,056 | 99,056 | 95,492 |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized cost | 99,502 | 99,502 | 96,668 |
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |
Fair value | 99,056 | 99,056 | 95,492 |
Mortgage-Backed, U.S. Government Agency Securities [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized cost | 447 | 447 | 533 |
Unrealized gains | 67 | 67 | 87 |
Unrealized losses | 0 | 0 | 0 |
Estimated fair value | 514 | 514 | 620 |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized cost | 447 | 447 | 533 |
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |
Fair value | 514 | 514 | 620 |
Collateralized Mortgage Obligations [Member] |  |  |  |
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Less than 12 months | 49,394 | 49,394 | 108,587 |
12 months or longer | 31,627 | 31,627 | 35,209 |
Total | 81,021 | 81,021 | 143,796 |
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |
Less than 12 months | (160) | (160) | (319) |
12 months or longer | (943) | (943) | (1,189) |
Total | $ (1,103) | $ (1,103) | $ (1,508) |
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |
Less than 12 months | Position | 7 | 7 | 12 |
12 months or longer | Position | 4 | 4 | 4 |
Total | Position | 11 | 11 | 16 |
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized cost | $ 195,388 | $ 195,388 | $ 225,213 |
Unrealized gains | 1,135 | 1,135 | 1,060 |
Unrealized losses | 1,103 | 1,103 | 1,508 |
Estimated fair value | 195,420 | 195,420 | 224,765 |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized cost | 195,388 | 195,388 | 225,213 |
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |
Fair value | 195,420 | 195,420 | 224,765 |
State & Municipal [Member] |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Amortized cost | 198,972 | 198,972 | 205,534 |
Unrealized gains | 1,983 | 1,983 | 434 |
Unrealized losses | 534 | 534 | 1,795 |
Estimated fair value | 200,421 | 200,421 | 204,173 |
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Less than 12 months | 16,811 | 16,811 | 81,984 |
12 months or longer | 12,591 | 12,591 | 0 |
Total | 29,402 | 29,402 | 81,984 |
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |
Less than 12 months | (188) | (188) | (1,795) |
12 months or longer | (346) | (346) | 0 |
Total | $ (534) | $ (534) | $ (1,795) |
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |
Less than 12 months | Position | 21 | 21 | 155 |
12 months or longer | Position | 21 | 21 | 0 |
Total | Position | 42 | 42 | 155 |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized cost | $ 198,972 | $ 198,972 | $ 205,534 |
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |
Fair value | $ 200,421 | $ 200,421 | $ 204,173 |

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