Consolidated Statements of Comprehensive Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Interest income:      
Loans, including fees $ 96,664 $ 93,439 $ 92,493
Investment securities:      
Taxable interest income 4,505 3,567 4,474
Nontaxable interest income 413 443 570
Federal funds sold and bank deposits 85 114 33
Total interest income 101,667 97,563 97,570
Interest expense:      
Deposits 9,707 10,418 11,073
Other borrowings 406 810 1,763
Subordinated debt 1,113 2,733 4,242
Total interest expense 11,226 13,961 17,078
Net interest income 90,441 83,602 80,492
Provision for loan losses 531 5,440 13,420
Net interest income after provision for loan losses 89,910 78,162 67,072
Noninterest income:      
Service charges on deposit accounts 4,438 4,156 4,686
Other fees and charges 4,349 3,871 3,360
Mortgage banking activities 55,781 66,560 56,332
Indirect lending activities 18,457 9,040 6,414
SBA lending activities 4,987 3,640 4,944
Bank owned life insurance 1,673 1,273 1,307
Securities gains 0 189 307
Other 5,635 8,149 10,611
Total noninterest income 95,320 96,878 87,961
Noninterest expense:      
Salaries and employee benefits 67,006 57,645 47,832
Commissions 19,988 24,676 21,817
Occupancy 12,985 10,342 9,253
Communication 3,897 3,031 2,502
Other 34,878 36,631 33,993
Total noninterest expense 138,754 132,325 115,397
Income before income tax expense 46,476 42,715 39,636
Income tax expense 16,440 15,077 14,309
Net income 30,036 27,638 25,327
Preferred stock dividends and accretion of discount 0 (2,463) (3,293)
Net income available to common equity 30,036 25,175 22,034
Earnings per common share:      
Basic earnings per share (in dollars per share) $ 1.41 $ 1.35 $ 1.47
Diluted earnings per share (in dollars per share) $ 1.28 $ 1.21 $ 1.32
Change in net unrealized gains/(losses) on available-for-sale securities, net of income taxes of $1,130, $1,508, and $17 1,846 (2,460) 25
Adjustment for net gains included in net income, net of tax of $0, $72, and $117 0 (117) (190)
Other comprehensive income (loss), net of tax 1,846 (2,577) (165)
Total comprehensive income $ 31,882 $ 25,061 $ 25,162