Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets
Cash and due from banks	$ 47,048	$ 42,610
Federal funds sold	23,472	25,093
Mortgage loans held for sale	3,829	14,047
Securities available for sale (amortized cost of $400,498 in 2013 and $377,383 in 2012)	401,063	386,440
Federal Home Loan Bank stock	6,334	5,180
Other securities	1,013	1,000
Loans	1,709,258	1,584,594
Less allowance for loan losses	28,990	31,881
Net loans	1,680,268	1,552,713
Premises and equipment, net	39,989	36,532
Bank owned life insurance	28,920	28,149
Accrued interest receivable	5,507	5,091
Other assets	52,312	51,407
Total assets	2,289,755	2,148,262
Deposits:
Non-interest bearing	429,297	396,159
Interest bearing	1,453,154	1,385,534
Total deposits	1,882,451	1,781,693
Securities sold under agreements to repurchase	56,225	59,045
Federal funds purchased	31,861	16,552
Accrued interest payable	128	166
Other liabilities	29,233	22,949
Federal Home Loan Bank advances	32,422	31,882
Subordinated debentures	30,900	30,900
Total liabilities	2,063,220	1,943,187
Stockholders' equity:
Preferred stock, no par value. Authorized 1,000,000 shares; no shares issued or outstanding
Common stock, no par value. Authorized 20,000,000 shares; issued and outstanding 14,553,552 and 13,915,265 shares in 2013 and 2012, respectively	9,398	7,273
Additional paid-in capital	31,618	17,731
Retained earnings	185,618	174,650
Accumulated other comprehensive (loss) income	(99)	5,421
Total stockholders' equity	226,535	205,075
Total liabilities and stockholders' equity	$ 2,289,755	$ 2,148,262