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Quarterly Condensed Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]                      
Interest income $ 39,438 $ 37,293 $ 37,033 $ 35,460 $ 35,096 $ 33,180 $ 32,352 $ 32,151 $ 149,224 $ 132,779 $ 131,754
Interest expense 3,984 3,463 3,250 3,032 3,017 3,174 3,072 3,106 13,729 12,369 14,386
Net interest income 35,454 33,830 33,783 32,428 32,079 30,006 29,280 29,045 135,495 120,410 117,368
Provision for portfolio loan losses 964 3,038 716 833 543 599 2,150 1,580 5,551 4,872 4,409
Provision reversal for PCI loan losses (343) (1,194) (336) (73) (917) (227) 0 (3,270) (1,946) (4,414) 1,083
Net interest income after provision for loan losses 34,833 31,986 33,403 31,668 32,453 29,634 27,130 30,735 131,890 119,952 111,876
Noninterest income 9,029 6,976 7,049 6,005 6,557 4,729 5,806 3,583 29,059 20,675 16,631
Noninterest expense 23,181 20,814 21,353 20,762 22,886 19,932 19,458 19,950 86,110 82,226 87,463
Income before income tax expense 20,681 18,148 19,099 16,911 16,124 14,431 13,478 14,368 74,839 58,401 41,044
Income tax expense 7,053 6,316 6,747 5,886 5,445 4,722 4,762 5,022 26,002 19,951 13,871
Net income $ 13,628 $ 11,832 $ 12,352 $ 11,025 $ 10,679 $ 9,709 $ 8,716 $ 9,346 $ 48,837 $ 38,450 $ 27,173
Earnings per common share:                      
Basic (usd per share) $ 0.68 $ 0.59 $ 0.62 $ 0.55 $ 0.53 $ 0.49 $ 0.44 $ 0.47 $ 2.44 $ 1.92 $ 1.38
Diluted (usd per share) $ 0.67 $ 0.59 $ 0.61 $ 0.54 $ 0.52 $ 0.48 $ 0.43 $ 0.46 $ 2.41 $ 1.89 $ 1.35