Consolidated Statements of Financial Position - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Cash and cash equivalents:
Cash and cash due from banks	$ 226,003	$ 237,758
Interest-bearing deposits with the Federal Reserve Bank and other banks	229,988	236,644
Total cash and cash equivalents	455,991	474,402
Investment securities:
Available-for-sale, at fair value	1,963,546	1,234,964
Held-to-maturity, at amortized cost (fair value of $662,906 and $608,531, respectively)	677,093	623,427
Total investment securities	2,640,639	1,858,391
Loans held-for-sale, at fair value	52,133	81,830
Loans	14,155,267	12,990,779
Allowance for loan losses	(91,887)	(78,268)
Net loans	14,063,380	12,912,511
Premises and equipment	126,896	145,012
Loan servicing rights ($63,841 and $48,085 measured at fair value, respectively)	63,841	58,315
Goodwill	1,134,568	1,133,534
Other intangible assets	34,271	40,211
Interest receivable and other assets	709,154	650,973
Total assets	19,280,873	17,355,179
Deposits:
Noninterest-bearing	3,725,779	3,341,520
Interest-bearing	9,917,024	9,531,602
Total deposits	13,642,803	12,873,122
Interest payable and other liabilities	181,203	134,637
Securities sold under agreements to repurchase with customers	415,236	343,047
Short-term borrowings	2,000,000	825,000
Long-term borrowings	372,882	597,847
Total liabilities	16,612,124	14,773,653
Shareholders' equity
Preferred stock, no par value: Authorized – 2,000,000 shares at 12/31/16 and 12/31/15	0	0
Common stock, $1 par value per share: Authorized — 100,000,000 shares at 12/31/16 and 60,000,000 shares at 12/31/15, Issued and outstanding — 70,599,133 shares at 12/31/16 and 38,167,861 shares at 12/31/15	71,207	70,599
Additional paid-in capital	2,203,637	2,210,762
Retained earnings	419,403	340,201
Accumulated other comprehensive loss	(25,498)	(40,036)
Total shareholders' equity	2,668,749	2,581,526
Total liabilities and shareholders' equity	$ 19,280,873	$ 17,355,179