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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, 2016 | Dec. 31, 2015
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | $ 813,659 |  | $ 886,560 |
Other investments | 54,066 |  | 62,952 |
Loans Held for Sale | 7,855 |  | 5,763 |
Other Assets | 19,928 | [1] | 11,273 | [2]
Total Assets | 895,508 |  | 966,548 |
Other Liabilities | 18,879 | [1] | 10,829 | [2]
Total Liabilities | 18,879 |  | 10,829 |
Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 811,989 |  | 884,390 |
Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 1,670 |  | 2,170 |
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 | 17,976 |  | 22,092 |
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 | 704,626 |  | 777,577 |
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 | 1 |  | 28 |
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 | 19,307 |  | 19,118 |
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 | 27,951 |  | 27,598 |
Corporate Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale, at fair value | 6,519 |  | 2,319 |
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 | 35,609 |  | 35,658 |
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 | 776,380 |  | 848,732 |
Other investments | 54,066 |  | 62,952 |
Loans Held for Sale | 7,855 |  | 5,763 |
Other Assets | 19,224 | [1] | 11,273 | [2]
Total Assets | 857,525 |  | 928,720 |
Other Liabilities | 18,879 | [1] | 10,829 | [2]
Total Liabilities | 18,879 |  | 10,829 |
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 | 776,380 |  | 848,732 |
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 | 17,976 |  | 22,092 |
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 | 704,626 |  | 777,577 |
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 | 1 |  | 28 |
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 | 19,307 |  | 19,118 |
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 | 27,951 |  | 27,598 |
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 | 6,519 |  | 2,319 |
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 | 37,279 |  | 37,828 |
Other investments | 0 |  | 0 |
Loans Held for Sale | 0 |  | 0 |
Other Assets | 704 | [1] | 0 | [2]
Total Assets | 37,983 |  | 37,828 |
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 | 35,609 |  | 35,658 |
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 | 1,670 |  | 2,170 |
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 |  |  | $ 35,658 |
[1] | Hedging and non-hedging interest rate derivatives
[2] | on-hedging interest rate derivatives

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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=51813488&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=49167202&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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