Loans and Allowance for Loan Losses - Credit Quality Indicators (Details) (USD $)																																																																																																																																																																																							9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Real Estate Loans Owner Occupied	Dec. 31, 2012 Real Estate Loans Owner Occupied	Sep. 30, 2013 Real Estate Loans Owner Occupied High Quality	Dec. 31, 2012 Real Estate Loans Owner Occupied High Quality	Sep. 30, 2013 Real Estate Loans Owner Occupied Good Quality	Dec. 31, 2012 Real Estate Loans Owner Occupied Good Quality	Sep. 30, 2013 Real Estate Loans Owner Occupied Satisfactory	Dec. 31, 2012 Real Estate Loans Owner Occupied Satisfactory	Sep. 30, 2013 Real Estate Loans Owner Occupied Merits Attention	Dec. 31, 2012 Real Estate Loans Owner Occupied Merits Attention	Sep. 30, 2013 Real Estate Loans Owner Occupied Special Mention	Dec. 31, 2012 Real Estate Loans Owner Occupied Special Mention	Sep. 30, 2013 Real Estate Loans Owner Occupied Substandard	Dec. 31, 2012 Real Estate Loans Owner Occupied Substandard	Sep. 30, 2013 Real Estate Loans Owner Occupied Substandard Impaired	Dec. 31, 2012 Real Estate Loans Owner Occupied Substandard Impaired	Sep. 30, 2013 Real Estate Loans Owner Occupied Doubtful	Dec. 31, 2012 Real Estate Loans Owner Occupied Doubtful	Sep. 30, 2013 Real Estate Loans Owner Occupied Loss	Dec. 31, 2012 Real Estate Loans Owner Occupied Loss	Sep. 30, 2013 Real Estate Loans Non-owner Occupied	Dec. 31, 2012 Real Estate Loans Non-owner Occupied	Sep. 30, 2013 Real Estate Loans Non-owner Occupied High Quality	Dec. 31, 2012 Real Estate Loans Non-owner Occupied High Quality	Sep. 30, 2013 Real Estate Loans Non-owner Occupied Good Quality	Dec. 31, 2012 Real Estate Loans Non-owner Occupied Good Quality	Sep. 30, 2013 Real Estate Loans Non-owner Occupied Satisfactory	Dec. 31, 2012 Real Estate Loans Non-owner Occupied Satisfactory	Sep. 30, 2013 Real Estate Loans Non-owner Occupied Merits Attention	Dec. 31, 2012 Real Estate Loans Non-owner Occupied Merits Attention	Sep. 30, 2013 Real Estate Loans Non-owner Occupied Special Mention	Dec. 31, 2012 Real Estate Loans Non-owner Occupied Special Mention	Sep. 30, 2013 Real Estate Loans Non-owner Occupied Substandard	Dec. 31, 2012 Real Estate Loans Non-owner Occupied Substandard	Sep. 30, 2013 Real Estate Loans Non-owner Occupied Substandard Impaired	Dec. 31, 2012 Real Estate Loans Non-owner Occupied Substandard Impaired	Sep. 30, 2013 Real Estate Loans Non-owner Occupied Doubtful	Dec. 31, 2012 Real Estate Loans Non-owner Occupied Doubtful	Sep. 30, 2013 Real Estate Loans Non-owner Occupied Loss	Dec. 31, 2012 Real Estate Loans Non-owner Occupied Loss	Sep. 30, 2013 Real Estate Loans One to Four Family	Dec. 31, 2012 Real Estate Loans One to Four Family	Sep. 30, 2013 Real Estate Loans One to Four Family High Quality	Dec. 31, 2012 Real Estate Loans One to Four Family High Quality	Sep. 30, 2013 Real Estate Loans One to Four Family Good Quality	Dec. 31, 2012 Real Estate Loans One to Four Family Good Quality	Sep. 30, 2013 Real Estate Loans One to Four Family Satisfactory	Dec. 31, 2012 Real Estate Loans One to Four Family Satisfactory	Sep. 30, 2013 Real Estate Loans One to Four Family Merits Attention	Dec. 31, 2012 Real Estate Loans One to Four Family Merits Attention	Sep. 30, 2013 Real Estate Loans One to Four Family Special Mention	Dec. 31, 2012 Real Estate Loans One to Four Family Special Mention	Sep. 30, 2013 Real Estate Loans One to Four Family Substandard	Dec. 31, 2012 Real Estate Loans One to Four Family Substandard	Sep. 30, 2013 Real Estate Loans One to Four Family Substandard Impaired	Dec. 31, 2012 Real Estate Loans One to Four Family Substandard Impaired	Sep. 30, 2013 Real Estate Loans One to Four Family Doubtful	Dec. 31, 2012 Real Estate Loans One to Four Family Doubtful	Sep. 30, 2013 Real Estate Loans One to Four Family Loss	Dec. 31, 2012 Real Estate Loans One to Four Family Loss	Sep. 30, 2013 Real Estate Loans Multifamily	Dec. 31, 2012 Real Estate Loans Multifamily	Sep. 30, 2013 Real Estate Loans Multifamily High Quality	Dec. 31, 2012 Real Estate Loans Multifamily High Quality	Sep. 30, 2013 Real Estate Loans Multifamily Good Quality	Dec. 31, 2012 Real Estate Loans Multifamily Good Quality	Sep. 30, 2013 Real Estate Loans Multifamily Satisfactory	Dec. 31, 2012 Real Estate Loans Multifamily Satisfactory	Sep. 30, 2013 Real Estate Loans Multifamily Merits Attention	Dec. 31, 2012 Real Estate Loans Multifamily Merits Attention	Sep. 30, 2013 Real Estate Loans Multifamily Special Mention	Dec. 31, 2012 Real Estate Loans Multifamily Special Mention	Sep. 30, 2013 Real Estate Loans Multifamily Substandard	Dec. 31, 2012 Real Estate Loans Multifamily Substandard	Sep. 30, 2013 Real Estate Loans Multifamily Substandard Impaired	Dec. 31, 2012 Real Estate Loans Multifamily Substandard Impaired	Sep. 30, 2013 Real Estate Loans Multifamily Doubtful	Dec. 31, 2012 Real Estate Loans Multifamily Doubtful	Sep. 30, 2013 Real Estate Loans Multifamily Loss	Dec. 31, 2012 Real Estate Loans Multifamily Loss	Sep. 30, 2013 Real Estate Loans Home Equity Lines of Credit	Dec. 31, 2012 Real Estate Loans Home Equity Lines of Credit	Sep. 30, 2013 Real Estate Loans Home Equity Lines of Credit High Quality	Dec. 31, 2012 Real Estate Loans Home Equity Lines of Credit High Quality	Sep. 30, 2013 Real Estate Loans Home Equity Lines of Credit Good Quality	Dec. 31, 2012 Real Estate Loans Home Equity Lines of Credit Good Quality	Sep. 30, 2013 Real Estate Loans Home Equity Lines of Credit Satisfactory	Dec. 31, 2012 Real Estate Loans Home Equity Lines of Credit Satisfactory	Sep. 30, 2013 Real Estate Loans Home Equity Lines of Credit Merits Attention	Dec. 31, 2012 Real Estate Loans Home Equity Lines of Credit Merits Attention	Sep. 30, 2013 Real Estate Loans Home Equity Lines of Credit Special Mention	Dec. 31, 2012 Real Estate Loans Home Equity Lines of Credit Special Mention	Sep. 30, 2013 Real Estate Loans Home Equity Lines of Credit Substandard	Dec. 31, 2012 Real Estate Loans Home Equity Lines of Credit Substandard	Sep. 30, 2013 Real Estate Loans Home Equity Lines of Credit Substandard Impaired	Dec. 31, 2012 Real Estate Loans Home Equity Lines of Credit Substandard Impaired	Sep. 30, 2013 Real Estate Loans Home Equity Lines of Credit Doubtful	Dec. 31, 2012 Real Estate Loans Home Equity Lines of Credit Doubtful	Sep. 30, 2013 Real Estate Loans Home Equity Lines of Credit Loss	Dec. 31, 2012 Real Estate Loans Home Equity Lines of Credit Loss	Sep. 30, 2013 Real Estate Loans Construction Loans	Dec. 31, 2012 Real Estate Loans Construction Loans	Sep. 30, 2013 Real Estate Loans Construction Loans High Quality	Dec. 31, 2012 Real Estate Loans Construction Loans High Quality	Sep. 30, 2013 Real Estate Loans Construction Loans Good Quality	Dec. 31, 2012 Real Estate Loans Construction Loans Good Quality	Sep. 30, 2013 Real Estate Loans Construction Loans Satisfactory	Dec. 31, 2012 Real Estate Loans Construction Loans Satisfactory	Sep. 30, 2013 Real Estate Loans Construction Loans Merits Attention	Dec. 31, 2012 Real Estate Loans Construction Loans Merits Attention	Sep. 30, 2013 Real Estate Loans Construction Loans Special Mention	Dec. 31, 2012 Real Estate Loans Construction Loans Special Mention	Sep. 30, 2013 Real Estate Loans Construction Loans Substandard	Dec. 31, 2012 Real Estate Loans Construction Loans Substandard	Sep. 30, 2013 Real Estate Loans Construction Loans Substandard Impaired	Dec. 31, 2012 Real Estate Loans Construction Loans Substandard Impaired	Sep. 30, 2013 Real Estate Loans Construction Loans Doubtful	Dec. 31, 2012 Real Estate Loans Construction Loans Doubtful	Sep. 30, 2013 Real Estate Loans Construction Loans Loss	Dec. 31, 2012 Real Estate Loans Construction Loans Loss	Sep. 30, 2013 Commercial	Dec. 31, 2012 Commercial	Sep. 30, 2013 Commercial High Quality	Dec. 31, 2012 Commercial High Quality	Sep. 30, 2013 Commercial Good Quality	Dec. 31, 2012 Commercial Good Quality	Sep. 30, 2013 Commercial Satisfactory	Dec. 31, 2012 Commercial Satisfactory	Sep. 30, 2013 Commercial Merits Attention	Dec. 31, 2012 Commercial Merits Attention	Sep. 30, 2013 Commercial Special Mention	Dec. 31, 2012 Commercial Special Mention	Sep. 30, 2013 Commercial Substandard	Dec. 31, 2012 Commercial Substandard	Sep. 30, 2013 Commercial Substandard Impaired	Dec. 31, 2012 Commercial Substandard Impaired	Sep. 30, 2013 Commercial Doubtful	Dec. 31, 2012 Commercial Doubtful	Sep. 30, 2013 Commercial Loss	Dec. 31, 2012 Commercial Loss	Sep. 30, 2013 Consumer and other	Dec. 31, 2012 Consumer and other	Sep. 30, 2013 Consumer and other High Quality	Dec. 31, 2012 Consumer and other High Quality	Sep. 30, 2013 Consumer and other Good Quality	Dec. 31, 2012 Consumer and other Good Quality	Sep. 30, 2013 Consumer and other Satisfactory	Dec. 31, 2012 Consumer and other Satisfactory	Sep. 30, 2013 Consumer and other Merits Attention	Dec. 31, 2012 Consumer and other Merits Attention	Sep. 30, 2013 Consumer and other Special Mention	Dec. 31, 2012 Consumer and other Special Mention	Sep. 30, 2013 Consumer and other Substandard	Dec. 31, 2012 Consumer and other Substandard	Sep. 30, 2013 Consumer and other Substandard Impaired	Dec. 31, 2012 Consumer and other Substandard Impaired	Sep. 30, 2013 Consumer and other Doubtful	Dec. 31, 2012 Consumer and other Doubtful	Sep. 30, 2013 Consumer and other Loss	Dec. 31, 2012 Consumer and other Loss	Sep. 30, 2013 Loans Receivable [Member]	Dec. 31, 2012 Loans Receivable [Member]	Sep. 30, 2013 Loans Receivable [Member] High Quality	Dec. 31, 2012 Loans Receivable [Member] High Quality	Sep. 30, 2013 Loans Receivable [Member] Good Quality	Dec. 31, 2012 Loans Receivable [Member] Good Quality	Sep. 30, 2013 Loans Receivable [Member] Satisfactory	Dec. 31, 2012 Loans Receivable [Member] Satisfactory	Sep. 30, 2013 Loans Receivable [Member] Merits Attention	Dec. 31, 2012 Loans Receivable [Member] Merits Attention	Sep. 30, 2013 Loans Receivable [Member] Special Mention	Dec. 31, 2012 Loans Receivable [Member] Special Mention	Sep. 30, 2013 Loans Receivable [Member] Substandard	Dec. 31, 2012 Loans Receivable [Member] Substandard	Sep. 30, 2013 Loans Receivable [Member] Substandard Impaired	Dec. 31, 2012 Loans Receivable [Member] Substandard Impaired	Sep. 30, 2013 Loans Receivable [Member] Doubtful	Dec. 31, 2012 Loans Receivable [Member] Doubtful	Sep. 30, 2013 Loans Receivable [Member] Loss	Dec. 31, 2012 Loans Receivable [Member] Loss	Sep. 30, 2013 Minimum
Credit Quality Indicators
Risk review threshold																																																																																																																																																																																							$ 20,000
Loans	$ 1,332,496,000	$ 1,308,372,000	$ 374,377,000	$ 342,962,000	$ 115,000	$ 119,000	$ 0	$ 0	$ 124,230,000	$ 115,347,000	$ 219,372,000	$ 191,958,000	$ 19,058,000	$ 23,396,000	$ 4,226,000	$ 4,286,000	$ 7,376,000	$ 7,856,000	$ 0	$ 0	$ 0	$ 0	$ 201,077,000	$ 211,489,000	$ 0	$ 0	$ 1,599,000	$ 0	$ 52,587,000	$ 58,577,000	$ 131,433,000	$ 129,283,000	$ 8,783,000	$ 16,084,000	$ 1,535,000	$ 2,136,000	$ 5,140,000	$ 5,409,000	$ 0	$ 0	$ 0	$ 0	$ 171,747,000	$ 168,611,000	$ 0	$ 375,000	$ 1,004,000	$ 1,301,000	$ 98,437,000	$ 95,727,000	$ 59,464,000	$ 56,629,000	$ 5,764,000	$ 7,862,000	$ 3,371,000	$ 2,850,000	$ 3,707,000	$ 3,867,000	$ 0	$ 0	$ 0	$ 0	$ 40,662,000	$ 35,337,000	$ 0	$ 0	$ 717,000	$ 0	$ 6,969,000	$ 7,945,000	$ 31,556,000	$ 25,681,000	$ 557,000	$ 571,000	$ 580,000	$ 601,000	$ 283,000	$ 539,000	$ 0	$ 0	$ 0	$ 0	$ 193,299,000	$ 191,888,000	$ 121,000	$ 111,000	$ 6,897,000	$ 6,756,000	$ 119,019,000	$ 118,497,000	$ 59,673,000	$ 59,568,000	$ 4,706,000	$ 4,228,000	$ 1,510,000	$ 1,687,000	$ 1,373,000	$ 1,041,000	$ 0	$ 0	$ 0	$ 0	$ 128,950,000	$ 131,981,000	$ 0	$ 0	$ 364,000	$ 464,000	$ 21,774,000	$ 22,284,000	$ 87,417,000	$ 78,668,000	$ 14,753,000	$ 16,797,000	$ 1,178,000	$ 3,939,000	$ 3,464,000	$ 9,829,000	$ 0	$ 0	$ 0	$ 0	$ 171,031,000	$ 174,440,000	$ 2,222,000	$ 2,430,000	$ 5,192,000	$ 5,738,000	$ 53,611,000	$ 62,071,000	$ 90,359,000	$ 82,243,000	$ 9,563,000	$ 16,809,000	$ 7,931,000	$ 1,009,000	$ 2,153,000	$ 4,140,000	$ 0	$ 0	$ 0	$ 0	$ 51,353,000	$ 51,664,000	$ 1,755,000	$ 2,289,000	$ 1,200,000	$ 1,316,000	$ 21,858,000	$ 22,459,000	$ 25,511,000	$ 24,425,000	$ 689,000	$ 551,000	$ 34,000	$ 122,000	$ 306,000	$ 502,000	$ 0	$ 0	$ 0	$ 0	$ 1,332,496,000	$ 1,308,372,000	$ 4,213,000	$ 5,324,000	$ 16,973,000	$ 15,575,000	$ 498,485,000	$ 502,907,000	$ 704,785,000	$ 648,455,000	$ 63,873,000	$ 86,298,000	$ 20,365,000	$ 16,630,000	$ 23,802,000	$ 33,183,000	$ 0	$ 0	$ 0	$ 0