Financial Assets and Liabilities at Dates Indicated that Were Accounted for or Disclosed at Fair Value (Detail) (USD $) | Mar. 31, 2014 | Dec. 31, 2013 |
In Thousands, unless otherwise specified |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Residential mortgage loans held for sale (at fair value) | $3,079 | $8,365 |
Investments available-for-sale (at fair value) | 736,270 | 751,284 |
Fair Value, Measurements, Recurring | Residential Mortgage Loans Held For Sale | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Residential mortgage loans held for sale (at fair value) | 3,079 | 8,365 |
Fair Value, Measurements, Recurring | U.S. Government Agencies | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 142,449 | 139,466 |
Fair Value, Measurements, Recurring | State and Municipal | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 166,491 | 165,428 |
Fair Value, Measurements, Recurring | Mortgage-Backed | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 423,480 | 442,250 |
Fair Value, Measurements, Recurring | Corporate Debt | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 2,003 | 2,004 |
Fair Value, Measurements, Recurring | Trust Preferred | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 1,124 | 1,413 |
Fair Value, Measurements, Recurring | Marketable Equity Securities | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 723 | 723 |
Fair Value, Measurements, Recurring | Interest Rate Swap Agreements | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other assets | 1,548 | 1,608 |
Other liabilities | -1,548 | -1,608 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Residential Mortgage Loans Held For Sale | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Residential mortgage loans held for sale (at fair value) | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | U.S. Government Agencies | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | State and Municipal | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Mortgage-Backed | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Corporate Debt | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Trust Preferred | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Marketable Equity Securities | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Interest Rate Swap Agreements | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other assets | 0 | 0 |
Other liabilities | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Residential Mortgage Loans Held For Sale | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Residential mortgage loans held for sale (at fair value) | 3,079 | 8,365 |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | U.S. Government Agencies | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 142,449 | 139,466 |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | State and Municipal | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 166,491 | 165,428 |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Mortgage-Backed | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 423,480 | 442,250 |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate Debt | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 2,003 | 2,004 |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Trust Preferred | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Marketable Equity Securities | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 723 | 723 |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Interest Rate Swap Agreements | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other assets | 1,548 | 1,608 |
Other liabilities | -1,548 | -1,608 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential Mortgage Loans Held For Sale | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Residential mortgage loans held for sale (at fair value) | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | U.S. Government Agencies | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | State and Municipal | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Mortgage-Backed | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate Debt | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Trust Preferred | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 1,124 | 1,413 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Marketable Equity Securities | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Investments available-for-sale (at fair value) | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Interest Rate Swap Agreements | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other assets | 0 | 0 |
Other liabilities | $0 | $0 |