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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 Amortized Cost and Estimated Fair Value of Investment Securities | The majority of securities held are publicly traded, and the estimated fair values were obtained from an independent pricing service based upon market quotes.
|  | December 31, 2014 |
|  | Amortized Cost |  |  | Gross Unrealized Holding Gain |  |  | Gross Unrealized Holding Loss |  |  | Fair Value |  |  | Total Percent |
|  | (Dollars in thousands) |
Investment securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency |  | $ | 339,071 |  |  | $ | — |  |  | $ | (8,228 | ) |  | $ | 330,843 |  |  |  | 10.55 | %
Residential mortgage-backed securities |  |  | 1,884,370 |  |  |  | 36,154 |  |  |  | (3,028 | ) |  |  | 1,917,496 |  |  |  | 61.12 | %
CMOs / REMICs — residential |  |  | 297,318 |  |  |  | 7,050 |  |  |  | (277 | ) |  |  | 304,091 |  |  |  | 9.69 | %
Municipal bonds |  |  | 557,823 |  |  |  | 22,463 |  |  |  | (645 | ) |  |  | 579,641 |  |  |  | 18.48 | %
Other securities |  |  | 5,000 |  |  |  | 87 |  |  |  | — |  |  |  | 5,087 |  |  |  | 0.16 | %
Total |  | $ | 3,083,582 |  |  | $ | 65,754 |  |  | $ | (12,178) |  |  | $ | 3,137,158 |  |  |  | 100.00 | %
|  | December 31, 2013 |
|  | Amortized Cost |  |  | Gross Unrealized Holding Gain |  |  | Gross Unrealized Holding Loss |  |  | Fair Value |  |  | Total Percent |
|  | (Dollars in thousands) |
Investment securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency |  | $ | 350,378 |  |  | $ | 22 |  |  | $ | (23,875 | ) |  | $ | 326,525 |  |  |  | 12.26 | %
Residential mortgage-backed securities |  |  | 1,391,631 |  |  |  | 13,100 |  |  |  | (24,788 | ) |  |  | 1,379,943 |  |  |  | 51.81 | %
CMOs / REMICs — residential |  |  | 361,573 |  |  |  | 6,576 |  |  |  | (1,974 | ) |  |  | 366,175 |  |  |  | 13.75 | %
Municipal bonds |  |  | 571,145 |  |  |  | 18,839 |  |  |  | (3,893 | ) |  |  | 586,091 |  |  |  | 22.00 | %
Other securities |  |  | 5,000 |  |  |  | — |  |  |  | (92 | ) |  |  | 4,908 |  |  |  | 0.18 | %
Total |  | $ | 2,679,727 |  |  | $ | 38,537 |  |  | $ | (54,622) |  |  | $ | 2,663,642 |  |  |  | 100.00 | %
Summary of Continuous Unrealized Loss Position of Securities | The tables below show the Company’s investment securities’ gross unrealized losses and fair value by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2014, and 2013. Management has reviewed individual securities to determine whether a decline in fair value below the amortized cost basis is other-than-temporary.
|  | December 31, 2014 |
|  | Less Than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  | Fair Value |  |  | Gross Unrealized Holding Losses |  |  | Fair Value |  |  | Gross Unrealized Holding Losses |  |  | Fair Value |  |  | Gross Unrealized Holding Losses |
|  | (Dollars in thousands) |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency |  | $ | 22,224 |  |  | $ | 28 |  |  | $ | 307,873 |  |  | $ | 8,200 |  |  | $ | 330,097 |  |  | $ | 8,228 |
Residential mortgage-backed securities |  |  | 19,636 |  |  |  | 4 |  |  |  | 145,681 |  |  |  | 3,024 |  |  |  | 165,317 |  |  |  | 3,028 |
CMOs /REMICs — residential |  |  | — |  |  |  | — |  |  |  | 31,143 |  |  |  | 277 |  |  |  | 31,143 |  |  |  | 277 |
Municipal bonds |  |  | 1,953 |  |  |  | 23 |  |  |  | 24,812 |  |  |  | 622 |  |  |  | 26,765 |  |  |  | 645 |
Other securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 43,813 |  |  | $ | 55 |  |  | $ | 509,509 |  |  | $ | 12,123 |  |  | $ | 553,322 |  |  | $ | 12,178 |
|  | December 31, 2013 |
|  | Less Than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  | Fair Value |  |  | Gross Unrealized Holding Losses |  |  | Fair Value |  |  | Gross Unrealized Holding Losses |  |  | Fair Value |  |  | Gross Unrealized Holding Losses |
|  | (Dollars in thousands) |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency |  | $ | 267,936 |  |  | $ | 20,514 |  |  | $ | 38,563 |  |  | $ | 3,361 |  |  | $ | 306,499 |  |  | $ | 23,875 |
Residential mortgage-backed securities |  |  | 851,621 |  |  |  | 23,313 |  |  |  | 22,999 |  |  |  | 1,475 |  |  |  | 874,620 |  |  |  | 24,788 |
CMOs / REMICs — residential |  |  | 104,322 |  |  |  | 1,780 |  |  |  | 17,747 |  |  |  | 194 |  |  |  | 122,069 |  |  |  | 1,974 |
Municipal bonds |  |  | 47,116 |  |  |  | 3,359 |  |  |  | 10,338 |  |  |  | 534 |  |  |  | 57,454 |  |  |  | 3,893 |
Other securities |  |  | 4,908 |  |  |  | 92 |  |  |  | — |  |  |  | — |  |  |  | 4,908 |  |  |  | 92 |
Total |  | $ | 1,275,903 |  |  | $ | 49,058 |  |  | $ | 89,647 |  |  | $ | 5,564 |  |  | $ | 1,365,550 |  |  | $ | 54,622 |
Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity | Mortgage-backed securities and CMO/REMICs are included in maturity categories based upon estimated prepayment speeds.
|  | December 31, 2014 |
|  | Amortized Cost |  |  | Fair Value |
|  | (Dollars in thousands) |
Available-for-sale: |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 156,040 |  |  | $ | 159,389 |
Due after one year through five years |  |  | 2,056,835 |  |  |  | 2,107,877 |
Due after five years through ten years |  |  | 757,260 |  |  |  | 754,160 |
Due after ten years |  |  | 113,447 |  |  |  | 115,732 |
Total |  | $ | 3,083,582 |  |  | $ | 3,137,158 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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