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Securities, Available for Sale (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) Position | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) Position | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) Position
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized cost | $ 1,363,616 |  | $ 1,363,616 |  | $ 1,341,059
Unrealized gains | 10,518 |  | 10,518 |  | 11,097
Unrealized losses | 8,613 |  | 8,613 |  | 13,866
Estimated fair value | 1,365,521 |  | 1,365,521 |  | 1,338,290
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | 799,017 |  | 799,017 |  | 902,506
12 months or longer | 11,338 |  | 11,338 |  | 5,831
Total | 810,355 |  | 810,355 |  | 908,337
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | (8,364) |  | (8,364) |  | (12,347)
12 months or longer | (249) |  | (249) |  | (1,519)
Total | $ (8,613) |  | $ (8,613) |  | $ (13,866)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |  |
Less than 12 months | Position | 153 |  | 153 |  | 171
12 months or longer | Position | 8 |  | 8 |  | 7
Total | Position | 161 |  | 161 |  | 178
OTTI loss realized on equity investment | $ 0 | $ 0 | $ 1,300 | $ 0 |
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |  |  |
Within one year | 63,613 |  | 63,613 |  |
From one to five years | 136,121 |  | 136,121 |  |
From five to ten years | 163,507 |  | 163,507 |  |
After ten years | 986,838 |  | 986,838 |  |
Amortized cost | 1,350,079 |  | 1,350,079 |  |
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |  |  |
Within one year | 63,631 |  | 63,631 |  |
From one to five years | 136,321 |  | 136,321 |  |
From five to ten years | 164,061 |  | 164,061 |  |
After ten years | 982,496 |  | 982,496 |  |
Fair value | 1,346,509 |  | 1,346,509 |  |
Federal Agency [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized cost | 159,999 |  | 159,999 |  | $ 175,135
Unrealized gains | 46 |  | 46 |  | 78
Unrealized losses | 525 |  | 525 |  | 805
Estimated fair value | 159,520 |  | 159,520 |  | 174,408
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | 109,778 |  | 109,778 |  | 119,363
12 months or longer | 0 |  | 0 |  | 0
Total | 109,778 |  | 109,778 |  | 119,363
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | (525) |  | (525) |  | (805)
12 months or longer | 0 |  | 0 |  | 0
Total | $ (525) |  | $ (525) |  | $ (805)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |  |
Less than 12 months | Position | 9 |  | 9 |  | 10
12 months or longer | Position | 0 |  | 0 |  | 0
Total | Position | 9 |  | 9 |  | 10
State & Municipal [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized cost | $ 44,023 |  | $ 44,023 |  | $ 47,053
Unrealized gains | 136 |  | 136 |  | 153
Unrealized losses | 139 |  | 139 |  | 480
Estimated fair value | 44,020 |  | 44,020 |  | 46,726
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | 23,771 |  | 23,771 |  | 31,873
12 months or longer | 1,052 |  | 1,052 |  | 483
Total | 24,823 |  | 24,823 |  | 32,356
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | (120) |  | (120) |  | (478)
12 months or longer | (19) |  | (19) |  | (2)
Total | $ (139) |  | $ (139) |  | $ (480)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |  |
Less than 12 months | Position | 36 |  | 36 |  | 55
12 months or longer | Position | 1 |  | 1 |  | 1
Total | Position | 37 |  | 37 |  | 56
Mortgage-Backed [Member] |  |  |  |  |
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | $ 210,648 |  | $ 210,648 |  | $ 277,524
12 months or longer | 963 |  | 963 |  | 985
Total | 211,611 |  | 211,611 |  | 278,509
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | (1,618) |  | (1,618) |  | (2,668)
12 months or longer | (13) |  | (13) |  | (13)
Total | $ (1,631) |  | $ (1,631) |  | $ (2,681)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |  |
Less than 12 months | Position | 46 |  | 46 |  | 49
12 months or longer | Position | 4 |  | 4 |  | 4
Total | Position | 50 |  | 50 |  | 53
Mortgage-Backed, Government Sponsored Enterprises [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized cost | $ 544,616 |  | $ 544,616 |  | $ 513,814
Unrealized gains | 3,503 |  | 3,503 |  | 3,345
Unrealized losses | 1,414 |  | 1,414 |  | 2,492
Estimated fair value | 546,705 |  | 546,705 |  | 514,667
Mortgage-Backed, U.S. Government Agency Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized cost | 17,167 |  | 17,167 |  | 14,955
Unrealized gains | 406 |  | 406 |  | 411
Unrealized losses | 217 |  | 217 |  | 189
Estimated fair value | 17,356 |  | 17,356 |  | 15,177
Collateralized Mortgage Obligations [Member] |  |  |  |  |
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | 452,830 |  | 452,830 |  | 473,746
12 months or longer | 6,347 |  | 6,347 |  | 0
Total | 459,177 |  | 459,177 |  | 473,746
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | (6,091) |  | (6,091) |  | (8,396)
12 months or longer | (88) |  | (88) |  | 0
Total | $ (6,179) |  | $ (6,179) |  | $ (8,396)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |  |
Less than 12 months | Position | 61 |  | 61 |  | 57
12 months or longer | Position | 2 |  | 2 |  | 0
Total | Position | 63 |  | 63 |  | 57
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized cost | $ 528,561 |  | $ 528,561 |  | $ 513,431
Unrealized gains | 622 |  | 622 |  | 532
Unrealized losses | 5,551 |  | 5,551 |  | 7,688
Estimated fair value | 523,632 |  | 523,632 |  | 506,275
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized cost | 55,713 |  | 55,713 |  | 60,822
Unrealized gains | 191 |  | 191 |  | 184
Unrealized losses | 628 |  | 628 |  | 708
Estimated fair value | 55,276 |  | 55,276 |  | 60,298
Other Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized cost | 13,537 |  | 13,537 |  | 15,849
Unrealized gains | 5,614 |  | 5,614 |  | 6,394
Unrealized losses | 139 |  | 139 |  | 1,504
Estimated fair value | 19,012 |  | 19,012 |  | 20,739
Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |
Less than 12 months | 1,990 |  | 1,990 |  | 0
12 months or longer | 2,976 |  | 2,976 |  | 4,363
Total | 4,966 |  | 4,966 |  | 4,363
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |  |  |
Less than 12 months | (10) |  | (10) |  | 0
12 months or longer | (129) |  | (129) |  | (1,504)
Total | $ (139) |  | $ (139) |  | $ (1,504)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |  |  |
Less than 12 months | Position | 1 |  | 1 |  | 0
12 months or longer | Position | 1 |  | 1 |  | 2
Total | Position | 2 |  | 2 |  | 2

X
- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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