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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 | Sep. 30, 2015 | Dec. 31, 2014
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | $ 1,050,733 |  | $ 1,309,819 |
Other investments | 53,976 |  | 44,545 |
Loans Held for Sale | 4,986 |  | 2,502 |
Other Assets | 16,303 | [1] | 11,186 | [2]
Total Assets | 1,125,998 |  | 1,368,052 |
Other Liabilities | 14,333 | [1] | 10,671 | [2]
Total Liabilities | 14,333 |  | 10,671 |
Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 1,048,813 |  | 1,308,399 |
Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 1,920 |  | 1,420 |
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 | 23,281 |  | 25,936 |
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 | 824,152 |  | 950,881 |
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 | 38 |  | 74 |
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 | 135,781 |  | 267,877 |
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 | 27,449 |  | 27,377 |
Corporate Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 2,333 |  | 7,255 |
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 | 35,779 |  | 28,999 |
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 | [1] | 0 | [2]
Total Assets | 0 |  | 0 |
Other Liabilities | 0 | [1] | 0 | [2]
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] | 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 - 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 | 1,013,034 |  | 1,279,400 |
Other investments | 53,976 |  | 44,545 |
Loans Held for Sale | 4,986 |  | 2,502 |
Other Assets | 16,303 | [1] | 11,186 | [2]
Total Assets | 1,088,299 |  | 1,337,633 |
Other Liabilities | 14,333 | [1] | 10,671 | [2]
Total Liabilities | 14,333 |  | 10,671 |
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 | 1,013,034 |  | 1,279,400 |
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 | 23,281 |  | 25,936 |
Level 2 [Member] | 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 | 824,152 |  | 950,881 |
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 | 38 |  | 74 |
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 | 135,781 |  | 267,877 |
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 | 27,449 |  | 27,377 |
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 | 2,333 |  | 7,255 |
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 | 37,699 |  | 30,419 |
Other investments | 0 |  | 0 |
Loans Held for Sale | 0 |  | 0 |
Other Assets | 0 | [1] | 0 | [2]
Total Assets | 37,699 |  | 30,419 |
Other Liabilities | 0 | [1] | 0 | [2]
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 | 35,779 |  | 28,999 |
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 | 1,920 |  | 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] | 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 - 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 |  |  | $ 28,999 |
[1] | Hedging and non-hedging interest rate derivatives
[2] | on-hedging interest rate derivatives

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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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