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Allowance for Loan Losses - Allowance for Loan Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for Credit Losses, Beginning Balance $ 10,556 $ 14,185 $ 12,147 $ 14,532  
Charge-offs (535) (855) (2,555) (2,567)  
Recoveries 259 721 588 944  
Provision (609) 457 (509) 1,599  
Allowance for Credit Losses, Ending Balance 9,671 14,508 9,671 14,508  
Individually evaluated for impairment 1,715 1,699 1,715 1,699  
Collectively evaluated for impairment 7,956 12,809 7,956 12,809  
Ending balance 586,674 594,030 586,674 594,030 566,722
Portfolio Balance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Collectively evaluated for impairment 564,020 568,959 564,020 568,959  
With No Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment 663 1,798 663 1,798  
With Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment 21,991 23,273 21,991 23,273  
Construction [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for Credit Losses, Beginning Balance 86 554 115 35  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 78 (17) 49 502  
Allowance for Credit Losses, Ending Balance 164 537 164 537  
Individually evaluated for impairment 0 1 0 1  
Collectively evaluated for impairment 164 537 164 537  
Ending balance 22,266 29,651 22,266 29,651  
Construction [Member] | Portfolio Balance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Collectively evaluated for impairment 22,255 29,635 22,255 29,635  
Construction [Member] | With No Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment 10 0 10 0  
Construction [Member] | With Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment 0 16 0 16  
Land, Farmland, Agriculture [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for Credit Losses, Beginning Balance 585 768 373 554  
Charge-offs (9) (2) (9) (358)  
Recoveries 8 2 10 5  
Provision (287) (294) (77) 273  
Allowance for Credit Losses, Ending Balance 297 474 297 474  
Individually evaluated for impairment 32 100 32 100  
Collectively evaluated for impairment 265 374 265 374  
Ending balance 17,108 14,141 17,108 14,141  
Land, Farmland, Agriculture [Member] | Portfolio Balance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Collectively evaluated for impairment 16,377 13,241 16,377 13,241  
Land, Farmland, Agriculture [Member] | With No Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment 458 0 458 0  
Land, Farmland, Agriculture [Member] | With Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment 273 900 273 900  
Residential [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for Credit Losses, Beginning Balance 5,880 6,396 6,980 8,277  
Charge-offs (425) (704) (1,854) (1,931)  
Recoveries 244 54 480 164  
Provision (313) 596 (220) (168)  
Allowance for Credit Losses, Ending Balance 5,386 6,342 5,386 6,342  
Individually evaluated for impairment 608 595 608 595  
Collectively evaluated for impairment 4,778 5,747 4,778 5,747  
Ending balance 269,267 284,094 269,267 284,094  
Residential [Member] | Portfolio Balance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Collectively evaluated for impairment 257,773 272,680 257,773 272,680  
Residential [Member] | With No Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment 127 589 127 589  
Residential [Member] | With Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment 11,369 10,825 11,369 10,825  
Commercial and Non-Residential [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for Credit Losses, Beginning Balance 2,063 4,118 2,011 2,565  
Charge-offs (2) (14) (293) (79)  
Recoveries 7 648 9 684  
Provision (330) (1,176) 11 406  
Allowance for Credit Losses, Ending Balance 1,738 3,576 1,738 3,576  
Individually evaluated for impairment 246 524 246 524  
Collectively evaluated for impairment 1,492 3,052 1,492 3,052  
Ending balance 139,538 150,681 139,538 150,681  
Commercial and Non-Residential [Member] | Portfolio Balance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Collectively evaluated for impairment 136,270 143,589 136,270 143,589  
Commercial and Non-Residential [Member] | With No Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment 36 1,143 36 1,143  
Commercial and Non-Residential [Member] | With Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment 3,232 5,949 3,232 5,949  
Consumer [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for Credit Losses, Beginning Balance 299 49 162 80  
Charge-offs (99) (128) (394) (130)  
Recoveries 0 16 83 17  
Provision 155 164 504 134  
Allowance for Credit Losses, Ending Balance 355 101 355 101  
Individually evaluated for impairment 113 39 113 39  
Collectively evaluated for impairment 242 62 242 62  
Ending balance 5,371 4,076 5,371 4,076  
Consumer [Member] | Portfolio Balance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Collectively evaluated for impairment 4,979 3,550 4,979 3,550  
Consumer [Member] | With No Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment 0 0 0 0  
Consumer [Member] | With Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment 392 526 392 526  
Commercial and Industrial [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for Credit Losses, Beginning Balance 379 612 1,075 537  
Charge-offs 0 (7) 0 (58)  
Recoveries 0 1 6 65  
Provision 35 (799) (667) 861  
Allowance for Credit Losses, Ending Balance 414 1,405 414 1,405  
Individually evaluated for impairment 8 34 8 34  
Collectively evaluated for impairment 406 1,371 406 1,371  
Ending balance 54,871 38,650 54,871 38,650  
Commercial and Industrial [Member] | Portfolio Balance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Collectively evaluated for impairment 54,756 38,092 54,756 38,092  
Commercial and Industrial [Member] | With No Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment 32 66 32 66  
Commercial and Industrial [Member] | With Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment 82 492 82 492  
Multi Family [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for Credit Losses, Beginning Balance 1,264 1,688 1,431 2,484  
Charge-offs 0 0 (5) (11)  
Recoveries 0 0 0 9  
Provision 53 385 (109) (409)  
Allowance for Credit Losses, Ending Balance 1,317 2,073 1,317 2,073  
Individually evaluated for impairment 708 406 708 406  
Collectively evaluated for impairment 609 1,666 609 1,666  
Ending balance 78,253 72,737 78,253 72,737  
Multi Family [Member] | Portfolio Balance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Collectively evaluated for impairment 71,610 68,172 71,610 68,172  
Multi Family [Member] | With No Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment 0 0 0 0  
Multi Family [Member] | With Related Allowance [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Individually evaluated for impairment $ 6,643 $ 4,565 $ 6,643 $ 4,565