Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Securities Available For Sale:
Securities available for sale	$ 685,991	$ 737,311
Trading Securities:
Trading securities	4,127	4,459
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities Available For Sale:
Securities available for sale	985	54,169
Trading Securities:
Trading securities	3,923	4,300
Liabilities:
Interest rate swaps	0	0
Significant Other Observable Inputs (Level 2) [Member]
Securities Available For Sale:
Securities available for sale	684,345	680,562
Trading Securities:
Trading securities	204	159
Liabilities:
Interest rate swaps	(1,116)	(1,745)
Significant Unobservable Inputs (Level 3) [Member]
Securities Available For Sale:
Securities available for sale	661	2,580
Trading Securities:
Trading securities	0	0
Liabilities:
Interest rate swaps	0	0
Fair Value Measurement on Recurring Basis [Member]
Securities Available For Sale:
Securities available for sale	685,991	737,311
Trading Securities:
Trading securities	4,127	4,459
Fair Value Measurement on Recurring Basis [Member] \| U.S. Treasury [Member]
Securities Available For Sale:
Securities available for sale	0	4,036
Fair Value Measurement on Recurring Basis [Member] \| U.S. Government Sponsored Entities [Member]
Securities Available For Sale:
Securities available for sale	181,625	163,781
Trading Securities:
Trading securities	52	58
Fair Value Measurement on Recurring Basis [Member] \| States and Political Subdivisions [Member]
Securities Available For Sale:
Securities available for sale	177,943	181,279
Fair Value Measurement on Recurring Basis [Member] \| Residential and Multi-Family Mortgage [Member]
Securities Available For Sale:
Securities available for sale	242,607	316,822
Fair Value Measurement on Recurring Basis [Member] \| Commercial Mortgage [Member]
Securities Available For Sale:
Securities available for sale	374	1,304
Fair Value Measurement on Recurring Basis [Member] \| Corporate Notes and Bonds [Member]
Securities Available For Sale:
Securities available for sale	14,075	15,024
Trading Securities:
Trading securities	152	101
Fair Value Measurement on Recurring Basis [Member] \| Pooled Trust Preferred [Member]
Securities Available For Sale:
Securities available for sale	661	600
Fair Value Measurement on Recurring Basis [Member] \| Pooled SBA [Member]
Securities Available For Sale:
Securities available for sale	67,721	52,927
Fair Value Measurement on Recurring Basis [Member] \| Other Securities [Member]
Securities Available For Sale:
Securities available for sale	985	1,538
Fair Value Measurement on Recurring Basis [Member] \| Corporate Equity Securities [Member]
Trading Securities:
Trading securities	2,705	3,117
Fair Value Measurement on Recurring Basis [Member] \| Certificates of Deposit [Member]
Trading Securities:
Trading securities	253	408
Fair Value Measurement on Recurring Basis [Member] \| International Mutual Funds [Member]
Trading Securities:
Trading securities	259	287
Fair Value Measurement on Recurring Basis [Member] \| Large Cap Growth Mutual Funds [Member]
Trading Securities:
Trading securities	197	157
Fair Value Measurement on Recurring Basis [Member] \| Money Market Mutual Funds [Member]
Trading Securities:
Trading securities	124	110
Fair Value Measurement on Recurring Basis [Member] \| Large Cap Value Mutual Funds [Member]
Trading Securities:
Trading securities	129	104
Fair Value Measurement on Recurring Basis [Member] \| Real Estate Investment Trust Mutual Funds [Member]
Trading Securities:
Trading securities	39	65
Fair Value Measurement on Recurring Basis [Member] \| Small Cap Mutual Funds [Member]
Trading Securities:
Trading securities	83	26
Fair Value Measurement on Recurring Basis [Member] \| Mid Cap Mutual Funds [Member]
Trading Securities:
Trading securities	84	26
Fair Value Measurement on Recurring Basis [Member] \| Interest Rate Swaps [Member]
Liabilities:
Interest rate swaps	(1,116)	(1,745)
Fair Value Measurement on Recurring Basis [Member] \| Commodities Mutual Funds [Member]
Trading Securities:
Trading securities	50
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities Available For Sale:
Securities available for sale	985	54,169
Trading Securities:
Trading securities	3,923	4,300
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| U.S. Treasury [Member]
Securities Available For Sale:
Securities available for sale	0	0
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| U.S. Government Sponsored Entities [Member]
Securities Available For Sale:
Securities available for sale	0	0
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| States and Political Subdivisions [Member]
Securities Available For Sale:
Securities available for sale	0	0
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Residential and Multi-Family Mortgage [Member]
Securities Available For Sale:
Securities available for sale	0	0
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Commercial Mortgage [Member]
Securities Available For Sale:
Securities available for sale	0	0
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Corporate Notes and Bonds [Member]
Securities Available For Sale:
Securities available for sale	0	0
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Pooled Trust Preferred [Member]
Securities Available For Sale:
Securities available for sale	0	0
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Pooled SBA [Member]
Securities Available For Sale:
Securities available for sale	0	52,631
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Other Securities [Member]
Securities Available For Sale:
Securities available for sale	985	1,538
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Corporate Equity Securities [Member]
Trading Securities:
Trading securities	2,705	3,117
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Certificates of Deposit [Member]
Trading Securities:
Trading securities	253	408
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| International Mutual Funds [Member]
Trading Securities:
Trading securities	259	287
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Large Cap Growth Mutual Funds [Member]
Trading Securities:
Trading securities	197	157
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Money Market Mutual Funds [Member]
Trading Securities:
Trading securities	124	110
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Large Cap Value Mutual Funds [Member]
Trading Securities:
Trading securities	129	104
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Real Estate Investment Trust Mutual Funds [Member]
Trading Securities:
Trading securities	39	65
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Small Cap Mutual Funds [Member]
Trading Securities:
Trading securities	83	26
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Mid Cap Mutual Funds [Member]
Trading Securities:
Trading securities	84	26
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Interest Rate Swaps [Member]
Liabilities:
Interest rate swaps	0	0
Fair Value Measurement on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Commodities Mutual Funds [Member]
Trading Securities:
Trading securities	50
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Securities Available For Sale:
Securities available for sale	684,345	680,562
Trading Securities:
Trading securities	204	159
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| U.S. Treasury [Member]
Securities Available For Sale:
Securities available for sale	0	4,036
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| U.S. Government Sponsored Entities [Member]
Securities Available For Sale:
Securities available for sale	181,625	163,781
Trading Securities:
Trading securities	52	58
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| States and Political Subdivisions [Member]
Securities Available For Sale:
Securities available for sale	177,943	181,279
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Residential and Multi-Family Mortgage [Member]
Securities Available For Sale:
Securities available for sale	242,607	316,822
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Commercial Mortgage [Member]
Securities Available For Sale:
Securities available for sale	374	1,304
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Corporate Notes and Bonds [Member]
Securities Available For Sale:
Securities available for sale	14,075	13,044
Trading Securities:
Trading securities	152	101
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Pooled Trust Preferred [Member]
Securities Available For Sale:
Securities available for sale	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Pooled SBA [Member]
Securities Available For Sale:
Securities available for sale	67,721	296
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Other Securities [Member]
Securities Available For Sale:
Securities available for sale	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Corporate Equity Securities [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Certificates of Deposit [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| International Mutual Funds [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Large Cap Growth Mutual Funds [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Money Market Mutual Funds [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Large Cap Value Mutual Funds [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Real Estate Investment Trust Mutual Funds [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Small Cap Mutual Funds [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Mid Cap Mutual Funds [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Interest Rate Swaps [Member]
Liabilities:
Interest rate swaps	(1,116)	(1,745)
Fair Value Measurement on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Commodities Mutual Funds [Member]
Trading Securities:
Trading securities	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Securities Available For Sale:
Securities available for sale	661	2,580
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| U.S. Treasury [Member]
Securities Available For Sale:
Securities available for sale	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| U.S. Government Sponsored Entities [Member]
Securities Available For Sale:
Securities available for sale	0	0
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| States and Political Subdivisions [Member]
Securities Available For Sale:
Securities available for sale	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Residential and Multi-Family Mortgage [Member]
Securities Available For Sale:
Securities available for sale	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Commercial Mortgage [Member]
Securities Available For Sale:
Securities available for sale	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Corporate Notes and Bonds [Member]
Securities Available For Sale:
Securities available for sale	0	1,980
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Pooled Trust Preferred [Member]
Securities Available For Sale:
Securities available for sale	661	600
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Pooled SBA [Member]
Securities Available For Sale:
Securities available for sale	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Other Securities [Member]
Securities Available For Sale:
Securities available for sale	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Corporate Equity Securities [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Certificates of Deposit [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| International Mutual Funds [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Large Cap Growth Mutual Funds [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Money Market Mutual Funds [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Large Cap Value Mutual Funds [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Real Estate Investment Trust Mutual Funds [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Small Cap Mutual Funds [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Mid Cap Mutual Funds [Member]
Trading Securities:
Trading securities	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Interest Rate Swaps [Member]
Liabilities:
Interest rate swaps	0	0
Fair Value Measurement on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Commodities Mutual Funds [Member]
Trading Securities:
Trading securities	$ 0