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Summary of Quarterly Earnings (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Information [Line Items]                      
Interest income $ 31,256 $ 31,536 $ 24,182 $ 22,682 $ 23,201 $ 23,050 $ 23,335 $ 24,590 $ 109,656 $ 94,176 $ 103,582
Interest expense 5,120 5,077 4,698 4,705 4,935 5,316 5,581 6,315 19,600 22,147 29,725
Net interest income 26,136 26,459 19,484 17,977 18,266 17,734 17,754 18,275 90,056 72,029 73,857
Provision for loan losses 1,220 1,916 1,620 922 2,436 1,920 3,079 1,612 5,678 9,047 14,757
Net interest income after provision for loan losses 24,916 24,543 17,864 17,055 15,830 15,814 14,675 16,663 84,378 62,982 59,100
Other income 9,000 10,935 8,352 7,940 6,580 7,888 8,139 7,663 7,200 3,888 3,663
Net gain (loss) on sale of securities 213 228 (9) 51 26 178 3,224 1,836 483 5,264 8,273
Other expenses 21,733 20,325 20,132 16,193 17,054 16,060 17,738 18,063 21,190 20,305 20,337
Income before income taxes 12,396 15,381 6,075 8,853 5,382 7,820 8,300 8,099 42,705 29,601 29,665
Income tax 3,957 5,322 1,997 2,852 2,151 2,502 2,572 2,348 14,128 9,573 7,818
Net income 8,439 10,059 4,078 6,001 3,231 5,318 5,728 5,751 28,577 20,028 21,847
Dividends on preferred stock 272 220 283 283 286 286 131   1,058 703  
Net income available to common shareholders $ 8,167 $ 9,839 $ 3,795 $ 5,718 $ 2,945 $ 5,032 $ 5,597 $ 5,751 $ 27,519 $ 19,325 $ 21,847
Basic earnings $ 0.41 $ 0.49 $ 0.20 $ 0.32 $ 0.16 $ 0.28 $ 0.31 $ 0.32 $ 1.44 $ 1.08 $ 1.23
Diluted earnings $ 0.39 $ 0.47 $ 0.20 $ 0.31 $ 0.17 $ 0.28 $ 0.31 $ 0.32 $ 1.40 $ 1.07 $ 1.23
Dividends $ 0.11 $ 0.11 $ 0.11 $ 0.10 $ 0.10 $ 0.10 $ 0.10 $ 0.10 $ 0.43 $ 0.40 $ 0.40
Weighted average basic shares outstanding 20,064 20,013 18,562 17,849 17,849 17,897 17,896 17,868 19,127,065 17,877,421 17,802,009
Weighted average diluted shares outstanding 21,379 21,476 19,909 19,190 19,159 19,206 18,534 17,887 20,481,398 18,691,081 17,822,944