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Fair Values of Assets and Liabilities - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | $ 1,351,039 |  | $ 1,318,365 |
Other investments | 34,047 |  | 35,444 |
US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 24,241 |  | 25,204 |
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Residential [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 1,013,607 |  | 994,887 |
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 98 |  | 105 |
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 267,310 |  | 266,125 |
Obligations of States and Political Subdivisions [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 9,359 |  | 80 |
Corporate Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 7,128 |  | 7,021 |
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 27,876 |  | 23,523 |
Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Other investments | 0 |  | 0 |
Loans Held for Sale | 0 |  | 0 |
Other Assets | 0 |  | 0 |
Total Assets | 0 |  | 0 |
Other Liabilities | 0 | [1] | 0 | [1]
Total Liabilities | 0 |  | 0 |
Level 1 [Member] | Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 1 [Member] | Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 1 [Member] | US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 1 [Member] | Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Residential [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 1 [Member] | Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 1 [Member] | Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 1 [Member] | Obligations of States and Political Subdivisions [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 1 [Member] | Corporate Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 1 [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 1,321,743 |  | 1,293,422 |
Other investments | 34,047 |  | 35,444 |
Loans Held for Sale | 0 |  | 0 |
Other Assets | 12,521 |  | 14,358 |
Total Assets | 1,368,311 |  | 1,343,224 |
Other Liabilities | 12,497 | [1] | 14,318 | [1]
Total Liabilities | 12,497 |  | 14,318 |
Level 2 [Member] | Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 1,321,743 |  | 1,293,422 |
Level 2 [Member] | Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 2 [Member] | US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 24,241 |  | 25,204 |
Level 2 [Member] | Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Residential [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 1,013,607 |  | 994,887 |
Level 2 [Member] | Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 98 |  | 105 |
Level 2 [Member] | Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 267,310 |  | 266,125 |
Level 2 [Member] | Obligations of States and Political Subdivisions [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 9,359 |  | 80 |
Level 2 [Member] | Corporate Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 7,128 |  | 7,021 |
Level 2 [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 29,296 |  | 24,943 |
Other investments | 0 |  | 0 |
Loans Held for Sale | 0 |  | 0 |
Other Assets | 0 |  | 0 |
Total Assets | 29,296 |  | 24,943 |
Other Liabilities | 0 | [1] | 0 | [1]
Total Liabilities | 0 |  | 0 |
Level 3 [Member] | Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 27,876 |  | 23,523 |
Level 3 [Member] | Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 1,420 |  | 1,420 |
Level 3 [Member] | US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 3 [Member] | Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Residential [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 3 [Member] | Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 3 [Member] | Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 3 [Member] | Obligations of States and Political Subdivisions [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 3 [Member] | Corporate Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 0 |  | 0 |
Level 3 [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 27,876 |  | 23,523 |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 1,351,039 |  | 1,318,365 |
Other investments | 34,047 |  | 35,444 |
Loans Held for Sale | 0 |  | 0 |
Other Assets | 12,521 |  | 14,358 |
Total Assets | 1,397,607 |  | 1,368,167 |
Other Liabilities | 12,497 | [1] | 14,318 | [1]
Total Liabilities | 12,497 |  | 14,318 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 1,349,619 |  | 1,316,945 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 1,420 |  | 1,420 |
Estimate of Fair Value, Fair Value Disclosure [Member] | US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 24,241 |  | 25,204 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Residential [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 1,013,607 |  | 994,887 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 98 |  | 105 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 267,310 |  | 266,125 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Obligations of States and Political Subdivisions [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 9,359 |  | 80 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 7,128 |  | 7,021 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | $ 27,876 |  | $ 23,523 |
[1] | Non-hedging interest rate derivatives

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 + Details
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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 Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478792&loc=d3e63345-112809 + Details
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- Definition Fair value of financial and nonfinancial obligations. + 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 + Details
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