Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest income
Interest and fees on loans	$ 75,220	$ 65,667	$ 214,486	$ 186,747
Interest Income, Securities, Operating, Taxable	6,664	5,642	19,381	16,618
Nontaxable interest and dividends on securities	14	19	46	71
Interest on loans held for sale	61	33	110	68
Interest on federal funds sold and short-term investments	916	417	1,768	814
Total interest and dividend income	82,875	71,778	235,791	204,318
Interest expense
Interest on deposits	5,251	3,331	13,773	9,010
Interest on borrowings	1,390	1,374	4,145	4,280
Total interest expense	6,641	4,705	17,918	13,290
Net interest income	76,234	67,073	217,873	191,028
Provision for loan losses	1,075	0	3,575	1,650
Net interest income after provision for loan losses	75,159	67,073	214,298	189,378
Noninterest income
Deposit account fees	4,658	4,401	13,640	13,337
Interchange and ATM fees	4,947	4,525	13,889	12,881
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions	6,564	5,967	19,528	17,576
Mortgage banking income	1,222	1,338	3,130	3,609
Gain Realized on Life Insurance Policies	(1,463)	0	(1,463)	0
Available-For-Sale- Securities - Equity - Gross Realized Gains	4	12	6	19
Increase in cash surrender value of life insurance policies	984	1,019	2,929	3,000
Loan level derivative income	392	784	1,547	2,727
Other noninterest income	3,030	2,724	8,882	7,931
Total noninterest income	23,264	20,770	65,014	61,080
Noninterest expenses
Salaries and employee benefits	31,095	29,289	92,483	86,267
Occupancy and equipment expenses	6,310	6,085	20,215	18,302
Data processing & facilities management	1,287	1,272	3,837	3,732
FDIC assessment	725	673	2,214	2,234
Advertising expense	1,395	1,359	3,684	4,018
Professional Fees	1,128	937	2,973	2,753
Debit Card Expense	755	992	2,405	2,616
Legal Fees	752	1,423	2,084	2,074
Available-For-Sale Securities - Equity Gross Realized Losses	0	1	0	6
Business Combination, Acquisition Related Costs	2,688	0	3,122	3,393
Software Maintenance	1,079	888	3,048	2,714
Other noninterest expenses	8,225	8,391	25,513	24,783
Total noninterest expenses	55,439	51,310	161,578	152,892
Income before income taxes	42,984	36,533	117,734	97,566
Provision for income taxes	9,969	12,681	26,046	32,426
Net income	$ 33,015	$ 23,852	$ 91,688	$ 65,140
Basic earnings per share (in dollars per share)	$ 1.20	$ 0.87	$ 3.33	$ 2.39
Diluted earnings per share (in dollars per share)	$ 1.20	$ 0.87	$ 3.32	$ 2.38
Weighted average common shares (basic) (in shares)	27,537,841	27,436,792	27,517,210	27,242,902
Common shares equivalents (in shares)	63,499	76,307	62,596	78,043
Weighted average common shares (diluted) (in shares)	27,601,340	27,513,099	27,579,806	27,320,945
Retained Earnings [Member]
Noninterest expenses
Net income			$ 91,688	$ 65,140
Cash dividends declared per common share (in dollars per share)	$ 0.38	$ 0.32	$ 1.14	$ 0.96