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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Summary of Investment Securities Available for Sale | The following is a summary of investment securities available for sale as of December 31, 2014 and 2013:
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Estimated Fair Value |
|  | (In thousands) |
December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities (1) (2) |  | $ | 571,678 |  |  | $ | 2,811 |  |  | $ | 1,203 |  |  | $ | 573,286 |
Collateralized mortgage obligations (1) |  |  | 188,704 |  |  |  | 417 |  |  |  | 1,074 |  |  |  | 188,047 |
U.S. government agency securities |  |  | 129,857 |  |  |  | 172 |  |  |  | 1,822 |  |  |  | 128,207 |
SBA loan pool securities |  |  | 109,983 |  |  |  | 52 |  |  |  | 588 |  |  |  | 109,447 |
Municipal bonds-tax exempt |  |  | 4,319 |  |  |  | 71 |  |  |  | — |  |  |  | 4,390 |
Municipal bonds-taxable |  |  | 16,615 |  |  |  | 398 |  |  |  | 91 |  |  |  | 16,922 |
Corporate bonds |  |  | 17,018 |  |  |  | 2 |  |  |  | 72 |  |  |  | 16,948 |
U.S. treasury securities |  |  | 163 |  |  |  | — |  |  |  | — |  |  |  | 163 |
Other securities |  |  | 22,916 |  |  |  | 57 |  |  |  | 80 |  |  |  | 22,893 |
Equity securities |  |  | 450 |  |  |  | — |  |  |  | 36 |  |  |  | 414 |
Total securities available for sale |  | $ | 1,061,703 |  |  | $ | 3,980 |  |  | $ | 4,966 |  |  | $ | 1,060,717 |
December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities (1) |  | $ | 222,768 |  |  | $ | 317 |  |  | $ | 6,026 |  |  | $ | 217,059 |
Collateralized mortgage obligations (1) |  |  | 130,636 |  |  |  | 274 |  |  |  | 3,217 |  |  |  | 127,693 |
U.S. government agency securities |  |  | 90,852 |  |  |  | — |  |  |  | 7,316 |  |  |  | 83,536 |
Municipal bonds-tax exempt |  |  | 13,857 |  |  |  | 110 |  |  |  | 30 |  |  |  | 13,937 |
Municipal bonds-taxable |  |  | 33,361 |  |  |  | 73 |  |  |  | 1,080 |  |  |  | 32,354 |
Corporate bonds |  |  | 21,013 |  |  |  | 8 |  |  |  | 186 |  |  |  | 20,835 |
U.S. treasury securities |  |  | 19,998 |  |  |  | — |  |  |  | 1 |  |  |  | 19,997 |
SBA loan pool securities |  |  | 13,598 |  |  |  | — |  |  |  | 969 |  |  |  | 12,629 |
Other securities |  |  | 3,030 |  |  |  | — |  |  |  | 144 |  |  |  | 2,886 |
Total securities available for sale |  | $ | 549,113 |  |  | $ | 782 |  |  | $ | 18,969 |  |  | $ | 530,926 |
(1) | Collateralized by residential mortgages and guaranteed by U.S. government sponsored entities
(2) | A portion of the mortgage-backed securities is comprised of home mortgage-backed securities backed by home equity conversion mortgages.
Schedule of Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity | The amortized cost and estimated fair value of investment securities as of December 31, 2014, by contractual maturity, are shown below. Although mortgage-backed securities and collateralized mortgage obligations have contractual maturities through 2064, expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
|  | Available for Sale |
|  | Amortized Cost |  |  | Estimated Fair Value |
|  | (In thousands) |
Within one year |  | $ | 17,693 |  |  | $ | 17,636 |
Over one year through five years |  |  | 45,470 |  |  |  | 45,450 |
Over five years through ten years |  |  | 127,601 |  |  |  | 126,506 |
Over ten years |  |  | 87,191 |  |  |  | 86,485 |
Mortgage-backed securities |  |  | 571,678 |  |  |  | 573,286 |
Collateralized mortgage obligations |  |  | 188,704 |  |  |  | 188,047 |
Other securities |  |  | 22,916 |  |  |  | 22,893 |
Equity securities |  |  | 450 |  |  |  | 414 |
Total |  | $ | 1,061,703 |  |  | $ | 1,060,717 |
Available for Sale Securities, Continuous Unrealized Loss Position, Fair value | Gross unrealized losses on investment securities available for sale, the estimated fair value of the related securities and the number of securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows as of December 31, 2014 and 2013:
|  | Holding Period |
|  | Less Than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Gross Unrealized Loss |  |  | Estimated Fair Value |  |  | Number of Securities |  |  | Gross Unrealized Loss |  |  | Estimated Fair Value |  |  | Number of Securities |  |  | Gross Unrealized Loss |  |  | Estimated Fair Value |  |  | Number of Securities |
|  | (In thousands, except number of securities) |
December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 288 |  |  | $ | 102,704 |  |  |  | 21 |  |  | $ | 915 |  |  | $ | 50,625 |  |  |  | 19 |  |  | $ | 1,203 |  |  | $ | 153,329 |  |  |  | 40 |
Collateralized mortgage obligations |  |  | 350 |  |  |  | 78,191 |  |  |  | 21 |  |  |  | 724 |  |  |  | 33,308 |  |  |  | 13 |  |  |  | 1,074 |  |  |  | 111,499 |  |  |  | 34 |
U.S. government agency securities |  |  | — |  |  |  | 5,000 |  |  |  | 1 |  |  |  | 1,822 |  |  |  | 73,142 |  |  |  | 26 |  |  |  | 1,822 |  |  |  | 78,142 |  |  |  | 27 |
SBA loan pool securities |  |  | 155 |  |  |  | 85,062 |  |  |  | 15 |  |  |  | 433 |  |  |  | 11,975 |  |  |  | 4 |  |  |  | 588 |  |  |  | 97,037 |  |  |  | 19 |
Municipal bonds-taxable |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 91 |  |  |  | 5,538 |  |  |  | 5 |  |  |  | 91 |  |  |  | 5,538 |  |  |  | 5 |
Corporate bonds |  |  | 4 |  |  |  | 5,021 |  |  |  | 1 |  |  |  | 68 |  |  |  | 7,925 |  |  |  | 2 |  |  |  | 72 |  |  |  | 12,946 |  |  |  | 3 |
Other securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 80 |  |  |  | 1,945 |  |  |  | 4 |  |  |  | 80 |  |  |  | 1,945 |  |  |  | 4 |
Equity Securities |  |  | 36 |  |  |  | 214 |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 36 |  |  |  | 214 |  |  |  | 1 |
Total |  | $ | 833 |  |  | $ | 276,192 |  |  |  | 60 |  |  | $ | 4,133 |  |  | $ | 184,458 |  |  |  | 73 |  |  | $ | 4,966 |  |  | $ | 460,650 |  |  |  | 133 |
December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 3,437 |  |  | $ | 170,324 |  |  |  | 51 |  |  | $ | 2,589 |  |  | $ | 30,947 |  |  |  | 12 |  |  | $ | 6,026 |  |  | $ | 201,271 |  |  |  | 63 |
Collateralized mortgage obligations |  |  | 2,353 |  |  |  | 87,026 |  |  |  | 27 |  |  |  | 864 |  |  |  | 14,657 |  |  |  | 7 |  |  |  | 3,217 |  |  |  | 101,683 |  |  |  | 34 |
U.S. government agency securities |  |  | 3,942 |  |  |  | 50,932 |  |  |  | 19 |  |  |  | 3,374 |  |  |  | 32,606 |  |  |  | 12 |  |  |  | 7,316 |  |  |  | 83,538 |  |  |  | 31 |
Municipal bonds-tax exempt |  |  | 30 |  |  |  | 8,562 |  |  |  | 5 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 30 |  |  |  | 8,562 |  |  |  | 5 |
Municipal bonds-taxable |  |  | 787 |  |  |  | 22,817 |  |  |  | 16 |  |  |  | 293 |  |  |  | 3,813 |  |  |  | 4 |  |  |  | 1,080 |  |  |  | 26,630 |  |  |  | 20 |
Corporate bonds |  |  | 9 |  |  |  | 5,024 |  |  |  | 1 |  |  |  | 177 |  |  |  | 11,803 |  |  |  | 3 |  |  |  | 186 |  |  |  | 16,827 |  |  |  | 4 |
U.S. treasury bills |  |  | 1 |  |  |  | 19,996 |  |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | 19,996 |  |  |  | 2 |
SBA loan pool securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 969 |  |  |  | 12,629 |  |  |  | 4 |  |  |  | 969 |  |  |  | 12,629 |  |  |  | 4 |
Other securities |  |  | 48 |  |  |  | 1,957 |  |  |  | 3 |  |  |  | 96 |  |  |  | 929 |  |  |  | 3 |  |  |  | 144 |  |  |  | 2,886 |  |  |  | 6 |
Total |  | $ | 10,607 |  |  | $ | 366,638 |  |  |  | 124 |  |  | $ | 8,362 |  |  | $ | 107,384 |  |  |  | 45 |  |  | $ | 18,969 |  |  | $ | 474,022 |  |  |  | 169 |
Realized Gains and Losses on Sales of Investment Securities | Realized gains and losses on sales of investment securities and proceeds from sales of investment securities were as follows for the periods indicated:
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Gross realized gains on sales of investment securities |  | $ | 2,012 |  |  | $ | 1,602 |  |  | $ | 1,447 |
Gross realized losses on sales of investment securities |  |  | (1 | ) |  |  | (563 | ) |  |  | (51 | )
Net realized gains on sales of investment securities |  | $ | 2,011 |  |  | $ | 1,039 |  |  | $ | 1,396 |
Proceeds from sales of investment securities |  | $ | 169,533 |  |  | $ | 78,473 |  |  | $ | 102,538 |

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