Loans - Impaired Loans of Company (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Financial Receivables [Line Items]      
Recorded Investment $ 33,472 $ 41,181  
Unpaid Principal Balance 37,985 43,747  
Related Allowance 376 649  
Average Recorded Investment 40,763 51,672 49,677
Interest Income Recognized 2,312 3,337 4,434
Interest Income Recognized on Cash Basis 1,190 2,172 3,286
Impaired Loans Without a Valuation Allowance [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 29,911 34,500  
Unpaid Principal Balance 34,297 36,754  
Related Allowance        
Impaired Loans With a Valuation Allowance [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 3,561 6,681  
Unpaid Principal Balance 3,688 6,993  
Related Allowance 376 649  
One-to Four-Family [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 4,089 4,486  
Related Allowance 132 128  
Average Recorded Investment 4,627 4,510 5,285
Interest Income Recognized 219 245 344
Interest Income Recognized on Cash Basis 192 196 288
One-to Four-Family [Member] | Impaired Loans Without a Valuation Allowance [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 2,399 2,157  
Unpaid Principal Balance 2,699 2,465  
Related Allowance        
One-to Four-Family [Member] | Impaired Loans With a Valuation Allowance [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 1,690 2,329  
Unpaid Principal Balance 1,806 2,330  
Related Allowance 132 128  
Multi-Family Residential Real Estate [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 4,002 5,784  
Related Allowance    90  
Average Recorded Investment 5,694 8,959 4,346
Interest Income Recognized 300 752 428
Interest Income Recognized on Cash Basis 292 717 415
Multi-Family Residential Real Estate [Member] | Impaired Loans Without a Valuation Allowance [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 4,002 5,419  
Unpaid Principal Balance 4,002 5,893  
Related Allowance        
Multi-Family Residential Real Estate [Member] | Impaired Loans With a Valuation Allowance [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment    365  
Unpaid Principal Balance    482  
Related Allowance    90  
Home Equity Lines of Credit [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 21 22  
Related Allowance        
Average Recorded Investment 22 23 124
Interest Income Recognized 1 1 8
Interest Income Recognized on Cash Basis 1 1 8
Home Equity Lines of Credit [Member] | Impaired Loans Without a Valuation Allowance [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 21 22  
Unpaid Principal Balance 21 22  
Related Allowance        
Commercial Real Estate [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 10,820 12,146  
Related Allowance 190 204  
Average Recorded Investment 13,010 14,479 12,383
Interest Income Recognized 654 857 959
Interest Income Recognized on Cash Basis 314 498 710
Commercial Real Estate [Member] | Impaired Loans Without a Valuation Allowance [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 9,327 9,752  
Unpaid Principal Balance 10,014 10,054  
Related Allowance        
Commercial Real Estate [Member] | Impaired Loans With a Valuation Allowance [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 1,493 2,394  
Unpaid Principal Balance 1,493 2,394  
Related Allowance 190 204  
Construction [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 13,308 18,319  
Related Allowance 54 227  
Average Recorded Investment 16,452 23,027 26,849
Interest Income Recognized 1,076 1,428 2,572
Interest Income Recognized on Cash Basis 359 706 1,750
Construction [Member] | Impaired Loans Without a Valuation Allowance [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 12,930 16,726  
Unpaid Principal Balance 15,926 17,818  
Related Allowance        
Construction [Member] | Impaired Loans With a Valuation Allowance [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 378 1,593  
Unpaid Principal Balance 389 1,787  
Related Allowance 54 227  
Commercial Business Loans [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 1,232 424  
Related Allowance        
Average Recorded Investment 958 674 690
Interest Income Recognized 62 54 123
Interest Income Recognized on Cash Basis 32 54 115
Commercial Business Loans [Member] | Impaired Loans Without a Valuation Allowance [Member]
     
Schedule Of Financial Receivables [Line Items]      
Recorded Investment 1,232 424  
Unpaid Principal Balance 1,635 502  
Related Allowance