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Fair Value of Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2013
Fair Value Disclosures [Abstract] |
Fair value measurement of assets and liabilities measured at fair value on a recurring basis |
|  |  | Fair Value Measurements At the End of the Reporting Period Using
(Dollars in thousands) | Fair Value December 31, 2013 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Investment securities, available-for-sale |  |  |  |  |  |  |
U.S. government sponsored enterprises | $ | 10,628 |  |  | — |  |  | 10,628 |  |  | — |
State and local governments | 1,385,078 |  |  | — |  |  | 1,385,078 |  |  | — |
Corporate bonds | 442,501 |  |  | — |  |  | 442,501 |  |  | — |
Residential mortgage-backed securities | 1,384,622 |  |  | — |  |  | 1,384,622 |  |  | — |
Interest rate swaps | 1,896 |  |  | — |  |  | 1,896 |  |  | — |
Total assets measured at fair value on a recurring basis | $ | 3,224,725 |  |  | — |  |  | 3,224,725 |  |  | — |
|  |  | Fair Value Measurements At the End of the Reporting Period Using
(Dollars in thousands) | Fair Value December 31, 2012 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Investment securities, available-for-sale |  |  |  |  |  |  |
U.S. government and federal agency | $ | 202 |  |  | — |  |  | 202 |  |  | — |
U.S. government sponsored enterprises | 17,480 |  |  | — |  |  | 17,480 |  |  | — |
State and local governments | 1,214,518 |  |  | — |  |  | 1,214,518 |  |  | — |
Corporate bonds | 288,795 |  |  | — |  |  | 288,795 |  |  | — |
Collateralized debt obligations | 1,708 |  |  | — |  |  | 1,708 |  |  | — |
Residential mortgage-backed securities | 2,160,302 |  |  | — |  |  | 2,160,302 |  |  | — |
Total assets measured at fair value on a recurring basis | $ | 3,683,005 |  |  | — |  |  | 3,683,005 |  |  | — |
Interest rate swaps | $ | 16,832 |  |  | — |  |  | 16,832 |  |  | — |
Total liabilities measured at fair value on a recurring basis | $ | 16,832 |  |  | — |  |  | 16,832 |  |  | — |
Fair value measurement of assets measured at fair value on a non-recurring basis |
|  |  | Fair Value Measurements At the End of the Reporting Period Using
(Dollars in thousands) | Fair Value December 31, 2013 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Other real estate owned | $ | 10,888 |  |  | — |  |  | — |  |  | 10,888 |
Collateral-dependent impaired loans, net of ALLL | 18,670 |  |  | — |  |  | — |  |  | 18,670 |
Total assets measured at fair value on a non-recurring basis | $ | 29,558 |  |  | — |  |  | — |  |  | 29,558 |
|  |  | Fair Value Measurements At the End of the Reporting Period Using
(Dollars in thousands) | Fair Value December 31, 2012 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Other real estate owned | $ | 13,983 |  |  | — |  |  | — |  |  | 13,983 |
Collateral-dependent impaired loans, net of ALLL | 22,966 |  |  | — |  |  | — |  |  | 22,966 |
Total assets measured at fair value on a non-recurring basis | $ | 36,949 |  |  | — |  |  | — |  |  | 36,949 |
Quantitative information about assets measured at fair value on a non-recurring basis for which Level 3 inputs were used |
| Fair Value |  | Quantitative Information about Level 3 Fair Value Measurements
(Dollars in thousands) | December 31, 2013 |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted- Average) 1
Other real estate owned | $ | 9,278 |  |  | Sales comparison approach |  | Selling costs |  | 7.0% - 10.0% (7.7%)
|  |  |  |  | Adjustment to comparables |  | 0.0% - 37.5% (1.4%)
| 1,610 |  |  | Combined approach |  | Selling costs |  | 5.0% - 10.0% (7.5%)
|  |  |  |  | Discount rate |  | 8.5% - 8.5% (8.5%)
|  |  |  |  | Adjustment to comparables |  | 25.0% - 25.0% (25.0%)
| $ | 10,888 |  |  |  |  |  |  |
Collateral-dependent impaired loans, net of ALLL | $ | 4,076 |  |  | Income approach |  | Selling costs |  | 8.0% - 8.0% (8.0%)
|  |  |  |  | Discount rate |  | 8.3% - 8.3% (8.3%)
| 11,784 |  |  | Sales comparison approach |  | Selling costs |  | 0.0% - 10.0% (7.9%)
|  |  |  |  | Adjustment to comparables |  | 0.0% - 1.0% (0.0%)
| 2,810 |  |  | Combined approach |  | Selling costs |  | 0.0% - 8.0% (7.8%)
|  |  |  |  | Discount rate |  | 7.3% - 7.3% (7.3%)
|  |  |  |  | Adjustment to comparables |  | 10.0% - 50.0% (18.9%)
| $ | 18,670 |  |  |  |  |  |  |
| Fair Value |  | Quantitative Information about Level 3 Fair Value Measurements
(Dollars in thousands) | December 31, 2012 |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted- Average) 1
Other real estate owned | $ | 93 |  |  | Cost approach |  | Selling costs |  | 7.0% - 7.0% (7.0%)
| 11,787 |  |  | Sales comparison approach |  | Selling costs |  | 7.0% - 14.0% (7.9%)
|  |  |  |  | Adjustment to comparables |  | 0.0% - 37.0% (11.7%)
| 2,103 |  |  | Combined approach |  | Selling costs |  | 5.0% - 8.0% (6.6%)
|  |  |  |  | Discount rate |  | 25.0% - 25.0% (25.0%)
|  |  |  |  | Adjustment to comparables |  | 0.0% - 30.0% (7.7%)
| $ | 13,983 |  |  |  |  |  |  |
Collateral-dependent impaired loans, net of ALLL | $ | 84 |  |  | Cost approach |  | Selling costs |  | 8.0% - 8.0% (8.0%)
| 5,509 |  |  | Income approach |  | Selling costs |  | 8.0% - 10.0% (8.2%)
|  |  |  |  | Discount rate |  | 0.0% - 8.3% (6.3%)
| 12,878 |  |  | Sales comparison approach |  | Selling costs |  | 0.0% - 16.0% (8.6%)
|  |  |  |  | Adjustment to comparables |  | 0.0% - 12.0% (1.6%)
| 4,495 |  |  | Combined approach |  | Selling costs |  | 8.0% - 10.0% (8.4%)
|  |  |  |  | Discount rate |  | 8.0% - 8.0% (8.0%)
|  |  |  |  | Adjustment to comparables |  | 0.0% - 36.0% (17.6%)
| $ | 22,966 |  |  |  |  |  |  |
__________ 1 The range for selling costs and adjustments to comparables indicate reductions to the fair value.
Carrying amounts and estimated fair values of financial instruments |
|  |  | Fair Value Measurements At the End of the Reporting Period Using
(Dollars in thousands) | Carrying Amount December 31, 2013 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Financial assets |  |  |  |  |  |  |
Cash and cash equivalents | $ | 155,657 |  |  | 155,657 |  |  | — |  |  | — |
Investment securities, available-for-sale | 3,222,829 |  |  | — |  |  | 3,222,829 |  |  | — |
Loans held for sale | 46,738 |  |  | 46,738 |  |  | — |  |  | — |
Loans receivable, net of ALLL | 3,932,487 |  |  | — |  |  | 3,807,993 |  |  | 187,731 |
Accrued interest receivable | 41,898 |  |  | 41,898 |  |  | — |  |  | — |
Non-marketable equity securities | 52,192 |  |  | — |  |  | 52,192 |  |  | — |
Interest rate swaps | 1,896 |  |  | — |  |  | 1,896 |  |  | — |
Total financial assets | $ | 7,453,697 |  |  | 244,293 |  |  | 7,084,910 |  |  | 187,731 |
Financial liabilities |  |  |  |  |  |  |
Deposits | $ | 5,579,967 |  |  | 4,258,213 |  |  | 1,341,382 |  |  | — |
FHLB advances | 840,182 |  |  | — |  |  | 857,551 |  |  | — |
Repurchase agreements and other borrowed funds | 321,781 |  |  | — |  |  | 321,781 |  |  | — |
Subordinated debentures | 125,562 |  |  | — |  |  | 71,501 |  |  | — |
Accrued interest payable | 3,505 |  |  | 3,505 |  |  | — |  |  | — |
Total financial liabilities | $ | 6,870,997 |  |  | 4,261,718 |  |  | 2,592,215 |  |  | — |
|  |  | Fair Value Measurements At the End of the Reporting Period Using
(Dollars in thousands) | Carrying Amount December 31, 2012 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Financial assets |  |  |  |  |  |  |
Cash and cash equivalents | $ | 187,040 |  |  | 187,040 |  |  | — |  |  | — |
Investment securities, available-for-sale | 3,683,005 |  |  | — |  |  | 3,683,005 |  |  | — |
Loans held for sale | 145,501 |  |  | 145,501 |  |  | — |  |  | — |
Loans receivable, net of ALLL | 3,266,571 |  |  | — |  |  | 3,184,987 |  |  | 186,201 |
Accrued interest receivable | 37,770 |  |  | 37,770 |  |  | — |  |  | — |
Non-marketable equity securities | 48,812 |  |  | — |  |  | 48,812 |  |  | — |
Total financial assets | $ | 7,368,699 |  |  | 370,311 |  |  | 6,916,804 |  |  | 186,201 |
Financial liabilities |  |  |  |  |  |  |
Deposits | $ | 5,364,461 |  |  | 3,585,126 |  |  | 1,789,134 |  |  | — |
FHLB advances | 997,013 |  |  | — |  |  | 1,027,101 |  |  | — |
Repurchase agreements and other borrowed funds | 299,540 |  |  | — |  |  | 299,540 |  |  | — |
Subordinated debentures | 125,418 |  |  | — |  |  | 70,895 |  |  | — |
Accrued interest payable | 4,675 |  |  | 4,675 |  |  | — |  |  | — |
Interest rate swaps | 16,832 |  |  | — |  |  | 16,832 |  |  | — |
Total financial liabilities | $ | 6,807,939 |  |  | 3,589,801 |  |  | 3,203,502 |  |  | — |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19296-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 + Details
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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets. This disclosure may include, but is not limited to, the fair value of the asset, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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