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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, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule Of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 27,364 | $ 26,696 | $ 27,412 | $ 28,004 | $ 31,256 | $ 31,536 | $ 24,182 | $ 22,682 | $ 109,476 | $ 109,656 | $ 94,176
Interest expense | 4,272 | 4,370 | 4,550 | 4,642 | 5,120 | 5,077 | 4,698 | 4,705 | 17,834 | 19,600 | 22,147
Net interest income | 23,092 | 22,326 | 22,862 | 23,362 | 26,136 | 26,459 | 19,484 | 17,977 | 91,642 | 90,056 | 72,029
Provision for loan losses | 1,528 | 2,333 | 3,205 | 1,142 | 1,220 | 1,916 | 1,620 | 922 | 8,208 | 5,678 | 9,047
Net interest income after provision for loan losses | 21,564 | 19,993 | 19,657 | 22,220 | 24,916 | 24,543 | 17,864 | 17,055 | 83,434 | 84,378 | 62,982
Other income | 6,743 | 8,150 | 6,735 | 7,744 | 9,000 | 10,935 | 8,352 | 7,940 | 5,235 | 6,742 | 3,888
Net gain (loss) on sale of securities | 208 | (39) | 113 | 117 | 213 | 228 | (9) | 51 | 399 | 483 | 5,264
Other expenses | 20,755 | 20,153 | 18,533 | 19,544 | 21,733 | 20,325 | 20,132 | 16,193 | 23,249 | 21,190 | 20,305
Income before income taxes | 7,760 | 7,951 | 7,972 | 10,537 | 12,396 | 15,381 | 6,075 | 8,853 | 34,220 | 42,705 | 29,601
Income tax | 2,436 | 2,539 | 2,537 | 3,396 | 3,957 | 5,322 | 1,997 | 2,852 | 10,908 | 14,128 | 9,573
Net income | 5,324 | 5,412 | 5,435 | 7,141 | 8,439 | 10,059 | 4,078 | 6,001 | 23,312 | 28,577 | 20,028
Dividends on preferred stock | 252 | 261 | 253 | 258 | 272 | 220 | 283 | 283 | 1,024 | 1,058 | 703
Net income available to common shareholders | $ 5,072 | $ 5,151 | $ 5,182 | $ 6,883 | $ 8,167 | $ 9,839 | $ 3,795 | $ 5,718 | $ 22,288 | $ 27,519 | $ 19,325
Basic earnings per common share | $ 0.27 | $ 0.26 | $ 0.26 | $ 0.34 | $ 0.41 | $ 0.49 | $ 0.20 | $ 0.32 | $ 1.13 | $ 1.44 | $ 1.08
Diluted earnings per common share | $ 0.26 | $ 0.26 | $ 0.26 | $ 0.34 | $ 0.40 | $ 0.47 | $ 0.21 | $ 0.31 | $ 1.11 | $ 1.40 | $ 1.07
Dividend per common share | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.10 | $ 0.48 | $ 0.43 | $ 0.40
Weighted average basic shares outstanding | 19,136,317 | 20,008,861 | 19,997,991 | 20,032,694 | 20,063,873 | 20,013,264 | 18,561,714 | 17,849,376 | 19,792,099 | 19,127,065 | 17,877,421
Weighted average diluted shares outstanding | 20,233,737 | 21,123,788 | 21,205,078 | 21,258,490 | 21,314,023 | 21,329,612 | 19,872,106 | 19,158,179 | 20,961,800 | 20,419,569 | 18,687,521

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