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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2018
Investment Securities |
Schedule of amortized cost and fair value of securities |
|  | June 30, 2018 |  | December 31, 2017
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |  | Amortized |  | Unrealized |  | Unrealized |  | Fair
(dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value |  | Cost |  | Gains |  | Losses |  | Value
U.S. Treasury securities |  | $ | 403,744 |  | $ | — |  | $ | (17,687) |  | $ | 386,057 |  | $ | 404,376 |  | $ | — |  | $ | (12,121) |  | $ | 392,255
Government-sponsored enterprises debt securities |  |  | 249,714 |  |  | — |  |  | (11,187) |  |  | 238,527 |  |  | 249,712 |  |  | — |  |  | (7,111) |  |  | 242,601
Government agency mortgage-backed securities |  |  | 455,769 |  |  | — |  |  | (16,919) |  |  | 438,850 |  |  | 356,858 |  |  | — |  |  | (5,468) |  |  | 351,390
Government-sponsored enterprises mortgage-backed securities |  |  | 168,151 |  |  | 109 |  |  | (7,019) |  |  | 161,241 |  |  | 178,702 |  |  | 169 |  |  | (4,130) |  |  | 174,741
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency |  |  | 3,057,867 |  |  | — |  |  | (133,061) |  |  | 2,924,806 |  |  | 3,367,173 |  |  | 47 |  |  | (76,746) |  |  | 3,290,474
Government-sponsored enterprises |  |  | 700,900 |  |  | — |  |  | (27,646) |  |  | 673,254 |  |  | 779,911 |  |  | 25 |  |  | (17,218) |  |  | 762,718
Debt securities issued by states and political subdivisions |  |  | 20,411 |  |  | — |  |  | (595) |  |  | 19,816 |  |  | 20,543 |  |  | — |  |  | (64) |  |  | 20,479
Total available-for-sale securities |  | $ | 5,056,556 |  | $ | 109 |  | $ | (214,114) |  | $ | 4,842,551 |  | $ | 5,357,275 |  | $ | 241 |  | $ | (122,858) |  | $ | 5,234,658
Schedule of amortized cost and fair value of debt securities by contractual maturity |
|  | June 30, 2018
|  | Amortized |  | Fair
(dollars in thousands) |  | Cost |  | Value
Due after one year through five years |  | $ | 478,744 |  | $ | 458,717
Due after five years through ten years |  |  | 174,714 |  |  | 165,867
Due after ten years |  |  | 20,411 |  |  | 19,816
|  |  | 673,869 |  |  | 644,400
Government agency mortgage-backed securities |  |  | 455,769 |  |  | 438,850
Government-sponsored enterprises mortgage-backed securities |  |  | 168,151 |  |  | 161,241
Collateralized mortgage obligations: |  |  |  |  |  |
Government agency |  |  | 3,057,867 |  |  | 2,924,806
Government-sponsored enterprises |  |  | 700,900 |  |  | 673,254
Total mortgage-backed securities and collateralized mortgage obligations |  |  | 4,382,687 |  |  | 4,198,151
Total available-for-sale securities |  | $ | 5,056,556 |  | $ | 4,842,551
Schedule of gross unrealized losses and fair values of securities in a continuous loss position |
|  | Time in Continuous Loss as of June 30, 2018
|  | Less Than 12 Months |  | 12 Months or More |  | Total
|  | Unrealized |  |  |  |  | Unrealized |  |  |  |  | Unrealized |  |  |
(dollars in thousands) |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value
U.S. Treasury securities |  | $ | (1,963) |  | $ | 47,287 |  | $ | (15,724) |  | $ | 338,770 |  | $ | (17,687) |  | $ | 386,057
Government-sponsored enterprises debt securities |  |  | (1,700) |  |  | 58,300 |  |  | (9,487) |  |  | 180,227 |  |  | (11,187) |  |  | 238,527
Government agency mortgage-backed securities |  |  | (8,499) |  |  | 304,708 |  |  | (8,420) |  |  | 134,142 |  |  | (16,919) |  |  | 438,850
Government-sponsored enterprises mortgage-backed securities |  |  | (1) |  |  | 189 |  |  | (7,018) |  |  | 155,708 |  |  | (7,019) |  |  | 155,897
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency |  |  | (42,264) |  |  | 1,162,582 |  |  | (90,796) |  |  | 1,762,224 |  |  | (133,060) |  |  | 2,924,806
Government-sponsored enterprises |  |  | (7,362) |  |  | 272,911 |  |  | (20,285) |  |  | 400,343 |  |  | (27,647) |  |  | 673,254
Debt securities issued by states and political subdivisions |  |  | (595) |  |  | 19,816 |  |  | — |  |  | — |  |  | (595) |  |  | 19,816
Total available-for-sale securities with unrealized losses |  | $ | (62,384) |  | $ | 1,865,793 |  | $ | (151,730) |  | $ | 2,971,414 |  | $ | (214,114) |  | $ | 4,837,207
|  | Time in Continuous Loss as of December 31, 2017
|  | Less Than 12 Months |  | 12 Months or More |  | Total
|  | Unrealized |  |  |  |  | Unrealized |  |  |  |  | Unrealized |  |  |
(dollars in thousands) |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value
U.S. Treasury securities |  | $ | (994) |  | $ | 48,182 |  | $ | (11,127) |  | $ | 344,073 |  | $ | (12,121) |  | $ | 392,255
Government-sponsored enterprises debt securities |  |  | (642) |  |  | 59,358 |  |  | (6,469) |  |  | 183,243 |  |  | (7,111) |  |  | 242,601
Government agency mortgage-backed securities |  |  | (976) |  |  | 200,963 |  |  | (4,492) |  |  | 150,427 |  |  | (5,468) |  |  | 351,390
Government-sponsored enterprises mortgage-backed securities |  |  | (1) |  |  | 63 |  |  | (4,129) |  |  | 168,342 |  |  | (4,130) |  |  | 168,405
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency |  |  | (23,236) |  |  | 1,473,170 |  |  | (53,510) |  |  | 1,803,338 |  |  | (76,746) |  |  | 3,276,508
Government-sponsored enterprises |  |  | (3,203) |  |  | 327,435 |  |  | (14,015) |  |  | 403,321 |  |  | (17,218) |  |  | 730,756
Debt securities issued by states and political subdivisions |  |  | (64) |  |  | 10,641 |  |  | — |  |  | — |  |  | (64) |  |  | 10,641
Total available-for-sale securities with unrealized losses |  | $ | (29,116) |  | $ | 2,119,812 |  | $ | (93,742) |  | $ | 3,052,744 |  | $ | (122,858) |  | $ | 5,172,556

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