Consolidated Statements of Financial Position - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Cash and cash equivalents:
Cash and cash due from banks	$ 191,940	$ 237,758
Interest-bearing deposits with the Federal Reserve Bank and other banks	249,840	236,644
Total cash and cash equivalents	441,780	474,402
Investment securities:
Available-for-sale, at fair value	1,275,846	1,234,964
Held-to-maturity, at amortized cost (fair value of $639,800 and $608,531, respectively)	647,192	623,427
Total investment securities	1,923,038	1,858,391
Loans held-for-sale, at fair value	39,123	81,830
Loans	13,273,392	12,990,779
Allowance for loan losses	(78,774)	(78,268)
Net loans	13,194,618	12,912,511
Premises and equipment	142,763	145,012
Loan servicing rights ($64,604 and $48,085 measured at fair value, respectively)	64,604	58,315
Goodwill	1,133,534	1,133,534
Other intangible assets	38,848	40,211
Interest receivable and other assets	658,665	650,973
Total assets	17,636,973	17,355,179
Deposits:
Noninterest-bearing	3,399,287	3,341,520
Interest-bearing	9,733,060	9,531,602
Total deposits	13,132,347	12,873,122
Interest payable and other liabilities	114,789	134,637
Securities sold under agreements to repurchase with customers	398,910	343,047
Short-term borrowings	900,000	825,000
Long-term borrowings	490,876	597,847
Total liabilities	15,036,922	14,773,653
Shareholders’ equity
Preferred stock, no par value: Authorized – 2,000,000 shares at 3/31/2017 and 12/31/2016, none issued	0	0
Common stock, $1.00 par value per share, Authorized - 100,000,000 shares at 3/31/2017 and 12/31/2016, Issued and outstanding — 71,117,908 shares at 3/31/2017 and 70,599,133 shares at 12/31/2016	71,118	70,599
Additional paid-in capital	2,194,705	2,210,762
Retained earnings	372,193	340,201
Accumulated other comprehensive loss	(37,965)	(40,036)
Total shareholders’ equity	2,600,051	2,581,526
Total liabilities and shareholders’ equity	$ 17,636,973	$ 17,355,179