Consolidated Statements of Financial Position - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Cash and cash equivalents:
Cash and cash due from banks	$ 179,310	$ 194,136	$ 167,054
Interest-bearing deposits with the Federal Reserve Bank and other banks	53,650	44,653	47,980
Total cash and cash equivalents	232,960	238,789	215,034
Investment securities:
Available-for-sale, at fair value	458,552	553,731	685,706
Held-to-maturity (fair value - $568,415 at June 30, 2016, $512,705 at December 31, 2015 and $466,578 at June 30, 2015)	552,828	509,971	469,837
Total investment securities	1,011,380	1,063,702	1,155,543
Loans held-for-sale, at fair value	13,990	10,327	7,798
Loans	7,647,269	7,271,147	7,034,743
Allowance for loan losses	(71,506)	(73,328)	(74,941)
Net loans	7,575,763	7,197,819	6,959,802
Premises and equipment (net of accumulated depreciation of $121,890 at June 30, 2016, $120,382 at December 31, 2015 and $112,530 at June 30, 2015)	102,709	106,317	111,968
Goodwill	286,867	287,393	285,512
Other intangible assets	34,270	38,104	41,201
Interest receivable and other assets	256,233	246,346	243,867
Total Assets	9,514,172	9,188,797	9,020,725
Deposits:
Noninterest-bearing	2,007,629	1,934,583	1,860,863
Interest-bearing	5,457,017	5,522,184	5,432,116
Total deposits	7,464,646	7,456,767	7,292,979
Interest payable and other liabilities	71,417	76,466	66,174
Securities Sold under Agreements to Repurchase	256,213	297,199	305,291
Short-term Borrowings	300,000	100,000	227,000
Other Borrowings	371,597	242,391	148,490
Total liabilities	8,463,873	8,172,823	8,039,934
Shareholders’ equity:
Preferred stock, no par value: Authorized - 2,000,000 shares, none issued	0	0	0
Common stock, $1 par value per share, Authorized - 60,000,000 shares, Issued and outstanding — 38,267,118 shares at June 30, 2016, 38,167,861 shares at December 31, 2015 and 38,110,136 shares at June 30, 2015	38,267	38,168	38,110
Additional paid-in capital	727,145	725,280	722,329
Retained earnings	310,585	281,558	251,456
Accumulated other comprehensive loss	(25,698)	(29,032)	(31,104)
Total shareholders’ equity	1,050,299	1,015,974	980,791
Total Liabilities and Shareholders’ Equity	$ 9,514,172	$ 9,188,797	$ 9,020,725