Condensed Consolidated Statements of Earnings and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income:
Loans and leases, including fees	$ 55,998	$ 47,754	$ 158,253	$ 143,781
Investment securities:
Investment securities available-for-sale	12,240	11,425	37,887	36,242
Investment securities held-to-maturity	5,184	4,787	16,014	14,878
Total investment income	17,424	16,212	53,901	51,120
Dividends from FHLB stock	318	403	1,070	1,210
Interest-earning deposits with other institutions and federal funds sold	130	802	683	1,575
Total interest income	73,870	65,171	213,907	197,686
Interest expense:
Deposits	1,555	1,525	4,547	4,544
Borrowings and customer repurchase agreements	402	349	1,213	1,117
Junior subordinated debentures	174	136	492	392
Total interest expense	2,131	2,010	6,252	6,053
Net interest income before recapture of provision for loan losses	71,739	63,161	207,655	191,633
Recapture of provision for loan losses	(1,500)	(2,000)	(7,000)	(2,000)
Net interest income after recapture of provision for loan losses	73,239	65,161	214,655	193,633
Noninterest income:
Service charges on deposit accounts	4,085	3,817	11,794	11,386
Trust and investment services	2,523	2,328	7,432	7,039
Bankcard services	927	827	2,563	2,166
BOLI income	692	706	2,904	2,005
Gain on sale of loans	0	0	0	1,101
Other	1,811	1,505	4,843	3,443
Total noninterest income	10,038	9,183	29,536	27,140
Noninterest expense:
Salaries and employee benefits	21,835	20,403	65,116	63,004
Occupancy and equipment	4,400	4,102	12,638	11,940
Professional services	1,091	1,404	4,191	3,727
Software licenses and maintenance	1,510	1,358	4,698	4,077
Marketing and promotion	1,055	1,199	3,484	3,818
Acquisition related expenses	250	353	2,176	1,557
Other	4,565	4,187	13,393	13,685
Total noninterest expense	34,706	33,006	105,696	101,808
Earnings before income taxes	48,571	41,338	138,495	118,965
Income taxes	18,888	15,890	51,935	44,612
Net earnings	29,683	25,448	86,560	74,353
Other comprehensive income (loss):
Unrealized gain (loss) on securities arising during the period, before tax	1,221	(3,709)	3,287	31,054
Less: Reclassification adjustment for net (gain) loss on securities included in net income	0	(548)	(402)	(548)
Other comprehensive income (loss), before tax	1,221	(4,257)	2,885	30,506
Less: Income tax (expense) benefit related to items of other comprehensive income	(513)	1,788	(1,212)	(12,812)
Other comprehensive income (loss), net of tax	708	(2,469)	1,673	17,694
Comprehensive income	$ 30,391	$ 22,979	$ 88,233	$ 92,047
Basic earnings per common share	$ 0.27	$ 0.23	$ 0.79	$ 0.69
Diluted earnings per common share	0.27	0.23	0.79	0.69
Cash dividends declared per common share	$ 0.14	$ 0.12	$ 0.40	$ 0.36