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Securities, Held to Maturity (Details) $ in Thousands | Jun. 30, 2018 USD ($) Position | Dec. 31, 2017 USD ($) Position
--- | --- | ---
Held-to-maturity securities, fair value to amortized cost [Abstract] |  |
Amortized cost | $ 544,163 | $ 484,073
Unrealized gains | 401 | 1,805
Unrealized losses | 11,585 | 4,007
Estimated fair value | 532,979 | 481,871
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | 280,192 | 156,340
12 months or longer | 79,783 | 87,037
Total | 359,975 | 243,377
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (6,689) | (1,336)
12 months or longer | (4,896) | (2,671)
Total | $ (11,585) | $ (4,007)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 138 | 59
12 months or longer | Position | 33 | 32
Total | Position | 171 | 91
Amortized costs of securities available for sale and held to maturity pledged to secure public deposits | $ 1,600,000 | $ 1,500,000
Amortized costs of securities AFS and HTM pledged as collateral for repurchase agreements | 226,200 | 256,200
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Within one year | 51,786 |
From one to five years | 50,159 |
From five to ten years | 201,007 |
After ten years | 241,211 |
Amortized cost | 544,163 | 484,073
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Within one year | 51,786 |
From one to five years | 50,281 |
From five to ten years | 196,191 |
After ten years | 234,721 |
Fair value | 532,979 | 481,871
Mortgage-Backed [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | 56,920 | 15,477
12 months or longer | 30,532 | 33,703
Total | 87,452 | 49,180
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (1,686) | (140)
12 months or longer | (1,558) | (670)
Total | $ (3,244) | $ (810)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 4 | 2
12 months or longer | Position | 2 | 2
Total | Position | 6 | 4
Mortgage-Backed, Government Sponsored Enterprises [Member] |  |
Held-to-maturity securities, fair value to amortized cost [Abstract] |  |
Amortized cost | $ 90,696 | $ 96,357
Unrealized gains | 0 | 85
Unrealized losses | 3,244 | 810
Estimated fair value | 87,452 | 95,632
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Amortized cost | 90,696 | 96,357
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Fair value | 87,452 | 95,632
Mortgage-Backed, U.S. Government Agency Securities [Member] |  |
Held-to-maturity securities, fair value to amortized cost [Abstract] |  |
Amortized cost | 376 | 418
Unrealized gains | 43 | 57
Unrealized losses | 0 | 0
Estimated fair value | 419 | 475
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Amortized cost | 376 | 418
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Fair value | 419 | 475
Collateralized Mortgage Obligations [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | 149,776 | 118,476
12 months or longer | 33,586 | 37,614
Total | 183,362 | 156,090
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (3,693) | (1,064)
12 months or longer | (2,296) | (1,513)
Total | $ (5,989) | $ (2,577)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 24 | 17
12 months or longer | Position | 6 | 6
Total | Position | 30 | 23
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member] |  |
Held-to-maturity securities, fair value to amortized cost [Abstract] |  |
Amortized cost | $ 229,353 | $ 186,327
Unrealized gains | 92 | 224
Unrealized losses | 5,989 | 2,577
Estimated fair value | 223,456 | 183,974
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Amortized cost | 229,353 | 186,327
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Fair value | 223,456 | 183,974
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member] |  |
Held-to-maturity securities, fair value to amortized cost [Abstract] |  |
Amortized cost | 9,788 |
Unrealized gains | 1 |
Unrealized losses | 0 |
Estimated fair value | 9,789 |
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Amortized cost | 9,788 |
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Fair value | 9,789 |
State & Municipal [Member] |  |
Held-to-maturity securities, fair value to amortized cost [Abstract] |  |
Amortized cost | 213,950 | 200,971
Unrealized gains | 265 | 1,439
Unrealized losses | 2,352 | 620
Estimated fair value | 211,863 | 201,790
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | 73,496 | 22,387
12 months or longer | 15,665 | 15,720
Total | 89,161 | 38,107
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (1,310) | (132)
12 months or longer | (1,042) | (488)
Total | $ (2,352) | $ (620)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 110 | 40
12 months or longer | Position | 25 | 24
Total | Position | 135 | 64
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract] |  |
Amortized cost | $ 213,950 | $ 200,971
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |
Fair value | $ 211,863 | $ 201,790

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