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v3.8.0.1

Securities, Available for Sale (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) Position | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) Position
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | $ 1,295,087 |  | $ 1,266,165
Unrealized gains | 1,215 |  | 5,893
Unrealized losses | 30,390 |  | 16,133
Estimated fair value | 1,265,912 |  | 1,255,925
Unrealized Loss Position, Fair Value [Abstract] |  |  |
Less than 12 months | 790,421 |  | 633,766
12 months or longer | 383,843 |  | 386,818
Total | 1,174,264 |  | 1,020,584
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |
Less than 12 months | (15,642) |  | (5,481)
12 months or longer | (14,748) |  | (10,652)
Total | $ (30,390) |  | $ (16,133)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |
Less than 12 months | Position | 178 |  | 134
12 months or longer | Position | 81 |  | 79
Total | Position | 259 |  | 213
OTTI loss realized on equity investment | $ 0 | $ 1,300 |
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract] |  |  |
Within one year | 99,647 |  |
From one to five years | 82,353 |  |
From five to ten years | 175,040 |  |
After ten years | 938,047 |  |
Amortized cost | 1,295,087 |  |
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract] |  |  |
Within one year | 99,288 |  |
From one to five years | 81,136 |  |
From five to ten years | 172,862 |  |
After ten years | 912,626 |  |
Fair value | 1,265,912 |  |
Federal Agency [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | 139,775 |  | $ 109,862
Unrealized gains | 0 |  | 0
Unrealized losses | 1,316 |  | 963
Estimated fair value | 138,459 |  | 108,899
Unrealized Loss Position, Fair Value [Abstract] |  |  |
Less than 12 months | 74,268 |  | 64,653
12 months or longer | 64,191 |  | 44,246
Total | 138,459 |  | 108,899
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |
Less than 12 months | (459) |  | (242)
12 months or longer | (857) |  | (721)
Total | $ (1,316) |  | $ (963)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |
Less than 12 months | Position | 6 |  | 5
12 months or longer | Position | 6 |  | 4
Total | Position | 12 |  | 9
State & Municipal [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | $ 39,700 |  | $ 42,171
Unrealized gains | 31 |  | 62
Unrealized losses | 345 |  | 277
Estimated fair value | 39,386 |  | 41,956
Unrealized Loss Position, Fair Value [Abstract] |  |  |
Less than 12 months | 25,927 |  | 23,566
12 months or longer | 4,979 |  | 5,994
Total | 30,906 |  | 29,560
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |
Less than 12 months | (271) |  | (200)
12 months or longer | (74) |  | (77)
Total | $ (345) |  | $ (277)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |
Less than 12 months | Position | 44 |  | 39
12 months or longer | Position | 7 |  | 8
Total | Position | 51 |  | 47
Mortgage-Backed [Member] |  |  |
Unrealized Loss Position, Fair Value [Abstract] |  |  |
Less than 12 months | $ 440,714 |  | $ 317,630
12 months or longer | 55,185 |  | 58,316
Total | 495,899 |  | 375,946
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |
Less than 12 months | (9,582) |  | (2,381)
12 months or longer | (2,118) |  | (1,187)
Total | $ (11,700) |  | $ (3,568)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |
Less than 12 months | Position | 90 |  | 55
12 months or longer | Position | 25 |  | 24
Total | Position | 115 |  | 79
Mortgage-Backed, Government Sponsored Enterprises [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | $ 524,468 |  | $ 530,392
Unrealized gains | 523 |  | 1,406
Unrealized losses | 11,155 |  | 3,345
Estimated fair value | 513,836 |  | 528,453
Mortgage-Backed, U.S. Government Agency Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | 30,473 |  | 26,363
Unrealized gains | 267 |  | 334
Unrealized losses | 545 |  | 223
Estimated fair value | 30,195 |  | 26,474
Collateralized Mortgage Obligations [Member] |  |  |
Unrealized Loss Position, Fair Value [Abstract] |  |  |
Less than 12 months | 249,512 |  | 227,917
12 months or longer | 259,488 |  | 275,303
Total | 509,000 |  | 503,220
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |
Less than 12 months | (5,330) |  | (2,658)
12 months or longer | (11,699) |  | (8,521)
Total | $ (17,029) |  | $ (11,179)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |
Less than 12 months | Position | 38 |  | 35
12 months or longer | Position | 43 |  | 42
Total | Position | 81 |  | 77
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | $ 511,727 |  | $ 496,033
Unrealized gains | 243 |  | 254
Unrealized losses | 15,541 |  | 10,114
Estimated fair value | 496,429 |  | 486,173
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | 48,944 |  | 50,721
Unrealized gains | 151 |  | 165
Unrealized losses | 1,488 |  | 1,065
Estimated fair value | $ 47,607 |  | 49,821
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost |  |  | 10,623
Unrealized gains |  |  | 3,672
Unrealized losses |  |  | 146
Estimated fair value |  |  | 14,149
Unrealized Loss Position, Fair Value [Abstract] |  |  |
Less than 12 months |  |  | 0
12 months or longer |  |  | 2,959
Total |  |  | 2,959
Unrealized Loss Position, Unrealized Losses [Abstract] |  |  |
Less than 12 months |  |  | 0
12 months or longer |  |  | (146)
Total |  |  | $ (146)
Unrealized Loss Position, Number of Positions [Abstract] |  |  |
Less than 12 months | Position |  |  | 0
12 months or longer | Position |  |  | 1
Total | Position |  |  | 1

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