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Securities Available for Sale (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 723,401 | $ 689,016
Gross Unrealized Gains | 5,043 | 16,824
Gross Unrealized Losses | (22,693) | (1,437)
Estimated Fair Value | 705,751 | 704,403
Amount of other than temporary impairment loss recognized | 0 |
Collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 286,608 | 249,373
Gross Unrealized Gains | 1,104 | 5,649
Gross Unrealized Losses | (13,611) | (110)
Estimated Fair Value | 274,101 | 254,912
Mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 409,165 | 415,925
Gross Unrealized Gains | 3,620 | 10,277
Gross Unrealized Losses | (7,789) | (662)
Estimated Fair Value | 404,996 | 425,540
Trust preferred securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,516 | 4,502
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (819) | (665)
Estimated Fair Value | 3,697 | 3,837
Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,687 | 4,506
Gross Unrealized Gains | 319 | 612
Gross Unrealized Losses | (70) | 0
Estimated Fair Value | 5,936 | 5,118
Total debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 705,976 | 674,306
Gross Unrealized Gains | 5,043 | 16,538
Gross Unrealized Losses | (22,289) | (1,437)
Estimated Fair Value | 688,730 | 689,407
Mutual funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 17,425 | 14,710
Gross Unrealized Gains | 0 | 286
Gross Unrealized Losses | (404) | 0
Estimated Fair Value | $ 17,021 | $ 14,996
Credit concentration risk | Stockholders' equity | Non-US government and agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maximum exposure to any single issuer | 10.00% | 10.00%

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: 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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