CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 32,721,000	$ 29,633,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	300,000	1,350,000
Depreciation of premises and equipment	2,535,000	2,350,000
Net amortization of premium and discount	1,149,000	672,000
Amortization of intangibles	571,000	489,000
Share-based compensation	1,640,000	1,433,000
Income from bank-owned life insurance	(1,480,000)	(1,354,000)
Net gain on sale of business line	0	(6,265,000)
Net gains on loan sales and commissions on loans originated for others	(7,296,000)	(4,688,000)
Equity in earnings (losses) of unconsolidated subsidiaries	224,000	213,000
Proceeds from sales of loans	365,533,000	176,389,000
Loans originated for sale	(345,322,000)	(196,322,000)
Decrease (increase) in other assets	2,683,000	(3,587,000)
Decrease in other liabilities	(5,059,000)	(89,000)
Net cash provided by operating activities	48,199,000	224,000
Cash flows from investing activities:
Purchases of mortgage-backed securities available for sale	(1,525,000)	(53,051,000)
Purchases of other investment securities available for sale	(63,229,000)	(31,009,000)
Proceeds from sale of other investment securities available for sale	0	547,000
Maturities and principal payments of mortgage-backed securities available for sale	38,312,000	63,938,000
Maturities and principal payments of other investment securities available for sale	58,583,000	38,137,000
Maturities and principal payments of mortgage-backed securities held to maturity	3,893,000	3,248,000
Net proceeds from sale of business line	0	7,205,000
Net increase in loans	(88,680,000)	(205,877,000)
Sale of Portfolio Loans	0	1,200,000
Purchases of loans, including purchased interest	(2,877,000)	(7,065,000)
Proceeds from the sale of property acquired through foreclosure or repossession	637,000	1,630,000
Purchases of premises and equipment	(3,220,000)	(3,315,000)
Purchases of bank-owned life insurance	0	5,000,000
Cash used in business combination, net of cash acquired	(1,671,000)	0
Net cash used in investing activities	(59,777,000)	(189,412,000)
Cash flows from financing activities:
Net increase (decrease) in deposits	81,462,000	233,567,000
Proceeds from Federal Home Loan Bank advances	348,000,000	259,000,000
Repayment of Federal Home Loan Bank advances	(372,648,000)	(285,397,000)
Proceeds from the exercise of stock options and issuance of other equity instruments	946,000	592,000
Tax benefit from stock option exercises and issuance of other compensation-related equity instruments	518,000	460,000
Cash dividends paid	(16,976,000)	(14,350,000)
Net cash provided by financing activities	41,302,000	193,872,000
Net increase in cash and cash equivalents	29,724,000	4,684,000
Cash and cash equivalents at beginning of period	80,350,000	85,317,000
Cash and cash equivalents at end of period	110,074,000	90,001,000
Noncash Investing and Financing Activities:
Loans charged off	1,401,000	1,638,000
Loans transferred to property acquired through foreclosure or repossession	491,000	1,659,000
Common stock issued for acquisition	5,430,000	0
Fair value of assets acquired, net of cash acquired	14,315,000	0
Fair value of liabilities assumed	7,214,000	0
Supplemental Disclosures:
Interest payments	16,690,000	15,779,000
Income tax payments	$ 14,995,000	$ 12,734,000