Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest income
Loans and lease financing	$ 130,283	$ 114,179	$ 253,834	$ 223,445
Available-for-sale securities	27,397	25,059	56,390	51,488
Other	1,339	781	3,731	2,007
Total interest income	159,019	140,019	313,955	276,940
Interest expense
Deposits	17,355	8,760	32,619	16,330
Short-term borrowings and long-term debt	261	5	261	11
Total interest expense	17,616	8,765	32,880	16,341
Net interest income	141,403	131,254	281,075	260,599
Provision for loan and lease losses	6,020	4,400	11,970	8,900
Net interest income after provision for loan and lease losses	135,383	126,854	269,105	251,699
Noninterest income:
Service charges on deposit accounts	7,721	9,238	15,676	18,619
Credit and debit card fees	16,929	16,019	32,426	32,324
Other service charges and fees	9,633	8,110	18,975	17,207
Trust and investment services income	7,711	7,526	15,942	14,864
Bank-owned life insurance	2,395	2,927	4,439	7,505
Other	5,408	6,738	11,039	11,098
Total noninterest income	49,797	50,558	98,497	101,617
Noninterest expense:
Salaries and employee benefits	41,636	40,364	83,796	80,772
Contracted services and professional fees	13,005	12,388	25,292	22,696
Occupancy	6,908	5,435	13,392	11,144
Equipment	4,335	4,527	8,923	8,724
Regulatory assessment and fees	4,225	3,750	8,198	7,524
Advertising and marketing	1,115	1,222	2,066	3,250
Card rewards program	6,359	5,894	12,077	11,669
Other	14,282	13,349	28,708	27,141
Total noninterest expense	91,865	86,929	182,452	172,920
Income before provision for income taxes	93,315	90,483	185,150	180,396
Provision for income taxes	24,262	33,588	48,139	66,761
Net income	$ 69,053	$ 56,895	$ 137,011	$ 113,635
Basic earnings per share (in dollars per share)	$ 0.50	$ 0.41	$ 0.99	$ 0.81
Diluted earnings per share (in dollars per share)	0.50	0.41	0.99	0.81
Dividends declared per share (in dollars per share)	$ 0.24	$ 0.22	$ 0.48	$ 0.44
Basic weighted-average outstanding shares (in shares)	137,907,063	139,546,615	138,749,209	139,546,174
Diluted weighted-average outstanding shares (in shares)	138,065,879	139,646,117	138,891,955	139,644,557