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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2017
Fair Value, Option, Quantitative Disclosures [Line Items] |
Securities Available for Sale | The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the fair value for securities available for sale at September 30, 2017 and December 31, 2016 (in thousands):
|  | September 30, 2017
|  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
U.S. Treasury obligations |  | $ | 5,995 |  |  | — |  |  | (1 | ) |  | 5,994 |
Agency obligations |  | 28,031 |  |  | 15 |  |  | (11 | ) |  | 28,035 |
Mortgage-backed securities |  | 965,863 |  |  | 7,477 |  |  | (4,928 | ) |  | 968,412 |
State and municipal obligations |  | 3,695 |  |  | 112 |  |  | — |  |  | 3,807 |
Corporate obligations |  | 21,049 |  |  | 420 |  |  | (10 | ) |  | 21,459 |
Equity securities |  | 397 |  |  | 201 |  |  | — |  |  | 598 |
|  | $ | 1,025,030 |  |  | 8,225 |  |  | (4,950 | ) |  | 1,028,305 |
|  | December 31, 2016
|  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
U.S. Treasury obligations |  | $ | 7,995 |  |  | 13 |  |  | — |  |  | 8,008 |
Agency obligations |  | 57,123 |  |  | 90 |  |  | (25 | ) |  | 57,188 |
Mortgage-backed securities |  | 952,992 |  |  | 7,249 |  |  | (8,380 | ) |  | 951,861 |
State and municipal obligations |  | 3,727 |  |  | 19 |  |  | (3 | ) |  | 3,743 |
Corporate obligations |  | 19,013 |  |  | 35 |  |  | (11 | ) |  | 19,037 |
Equity securities |  | 397 |  |  | 152 |  |  | — |  |  | 549 |
|  | $ | 1,041,247 |  |  | 7,558 |  |  | (8,419 | ) |  | 1,040,386 |
Available for sale securities with temporary impairment | The following tables present the fair value and gross unrealized losses for securities available for sale with temporary impairment at September 30, 2017 and December 31, 2016 (in thousands):
|  | September 30, 2017 Unrealized Losses
|  | Less than 12 months |  | 12 months or longer |  | Total
|  | Fair value |  | Gross unrealized losses |  | Fair value |  | Gross unrealized losses |  | Fair value |  | Gross unrealized losses
U.S. Treasury obligations |  | $ | 5,994 |  |  | (1 | ) |  | — |  |  | — |  |  | 5,994 |  |  | (1 | )
Agency obligations |  | 16,008 |  |  | (11 | ) |  | — |  |  | — |  |  | 16,008 |  |  | (11 | )
Mortgage-backed securities |  | 424,627 |  |  | (3,956 | ) |  | 50,881 |  |  | (972 | ) |  | 475,508 |  |  | (4,928 | )
Corporate obligations |  | — |  |  | — |  |  | 991 |  |  | (10 | ) |  | 991 |  |  | (10 | )
|  | $ | 446,629 |  |  | (3,968 | ) |  | 51,872 |  |  | (982 | ) |  | 498,501 |  |  | (4,950 | )
|  | December 31, 2016 Unrealized Losses
|  | Less than 12 months |  | 12 months or longer |  | Total
|  | Fair value |  | Gross unrealized losses |  | Fair value |  | Gross unrealized losses |  | Fair value |  | Gross unrealized losses
Agency obligations |  | $ | 14,000 |  |  | (25 | ) |  | — |  |  | — |  |  | 14,000 |  |  | (25 | )
Mortgage-backed securities |  | 553,629 |  |  | (8,377 | ) |  | 65 |  |  | (3 | ) |  | 553,694 |  |  | (8,380 | )
State and municipal obligations |  | 661 |  |  | (3 | ) |  | — |  |  | — |  |  | 661 |  |  | (3 | )
Corporate obligations |  | — |  |  | — |  |  | 990 |  |  | (11 | ) |  | 990 |  |  | (11 | )
|  | $ | 568,290 |  |  | (8,405 | ) |  | 1,055 |  |  | (14 | ) |  | 569,345 |  |  | (8,419 | )
Investment Securities Held to Maturity | The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the estimated fair value for investment securities held to maturity at September 30, 2017 and December 31, 2016 (in thousands):
|  | September 30, 2017
|  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Agency obligations |  | $ | 4,307 |  |  | — |  |  | (55 | ) |  | 4,252 |
Mortgage-backed securities |  | 475 |  |  | 17 |  |  | — |  |  | 492 |
State and municipal obligations |  | 467,113 |  |  | 10,407 |  |  | (1,761 | ) |  | 475,759 |
Corporate obligations |  | 9,950 |  |  | 6 |  |  | (34 | ) |  | 9,922 |
|  | $ | 481,845 |  |  | 10,430 |  |  | (1,850 | ) |  | 490,425 |
|  | December 31, 2016
|  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Agency obligations |  | $ | 4,306 |  |  | 2 |  |  | (83 | ) |  | 4,225 |
Mortgage-backed securities |  | 893 |  |  | 31 |  |  | — |  |  | 924 |
State and municipal obligations |  | 473,653 |  |  | 6,635 |  |  | (5,436 | ) |  | 474,852 |
Corporate obligations |  | 9,331 |  |  | 7 |  |  | (52 | ) |  | 9,286 |
|  | $ | 488,183 |  |  | 6,675 |  |  | (5,571 | ) |  | 489,287 |
The following tables present the fair value and gross unrealized losses for investment securities held to maturity with temporary impairment at September 30, 2017 and December 31, 2016 (in thousands):
|  | September 30, 2017 Unrealized Losses
|  | Less than 12 months |  | 12 months or longer |  | Total
|  | Fair value |  | Gross unrealized losses |  | Fair value |  | Gross unrealized losses |  | Fair value |  | Gross unrealized losses
Agency obligations |  | $ | 3,853 |  |  | (55 | ) |  | — |  |  | — |  |  | 3,853 |  |  | (55 | )
State and municipal obligations |  | 62,881 |  |  | (938 | ) |  | 22,251 |  |  | (823 | ) |  | 85,132 |  |  | (1,761 | )
Corporate obligations |  | 6,646 |  |  | (34 | ) |  | — |  |  | — |  |  | 6,646 |  |  | (34 | )
|  | $ | 73,380 |  |  | (1,027 | ) |  | 22,251 |  |  | (823 | ) |  | 95,631 |  |  | (1,850 | )
|  | December 31, 2016 Unrealized Losses
|  | Less than 12 months |  | 12 months or longer |  | Total
|  | Fair value |  | Gross unrealized losses |  | Fair value |  | Gross unrealized losses |  | Fair value |  | Gross unrealized losses
Agency obligations |  | $ | 3,525 |  |  | (83 | ) |  | — |  |  | — |  |  | 3,525 |  |  | (83 | )
State and municipal obligations |  | 172,152 |  |  | (5,132 | ) |  | 6,617 |  |  | (304 | ) |  | 178,769 |  |  | (5,436 | )
Corporate obligations |  | 4,697 |  |  | (52 | ) |  | — |  |  | — |  |  | 4,697 |  |  | (52 | )
|  | $ | 180,374 |  |  | (5,267 | ) |  | 6,617 |  |  | (304 | ) |  | 186,991 |  |  | (5,571 | )
Available-for-sale Securities [Member] |
Fair Value, Option, Quantitative Disclosures [Line Items] |
Investment Securities Classified by Contractual Maturity | The amortized cost and fair value of securities available for sale at September 30, 2017, by contractual maturity, are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.
|  | September 30, 2017
|  | Amortized cost |  | Fair value
Due in one year or less |  | $ | 35,452 |  |  | 35,445 |
Due after one year through five years |  | 2,423 |  |  | 2,471 |
Due after five years through ten years |  | 20,895 |  |  | 21,379 |
Due after ten years |  | — |  |  | — |
|  | $ | 58,770 |  |  | 59,295 |
Held-to-maturity Securities [Member] |
Fair Value, Option, Quantitative Disclosures [Line Items] |
Investment Securities Classified by Contractual Maturity | The amortized cost and fair value of investment securities in the held to maturity portfolio at September 30, 2017 by contractual maturity are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.
|  | September 30, 2017
|  | Amortized cost |  | Fair value
Due in one year or less |  | $ | 14,723 |  |  | 14,755 |
Due after one year through five years |  | 65,170 |  |  | 66,276 |
Due after five years through ten years |  | 254,191 |  |  | 259,908 |
Due after ten years |  | 147,286 |  |  | 148,994 |
|  | $ | 481,370 |  |  | 489,933 |

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