Consolidated Statements of Financial Position - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents:
Cash and cash due from banks	$ 228,527	$ 226,003
Interest-bearing deposits with the Federal Reserve Bank and other banks	267,312	229,988
Total cash and cash equivalents	495,839	455,991
Investment securities:
Carried at fair value	3,021,832	1,963,546
Held-to-maturity, at amortized cost (fair value of $618,672 and $662,906, respectively)	624,099	677,093
Total investment securities	3,645,931	2,640,639
Loans held-for-sale, at fair value	85,030	52,133
Loans	15,269,779	14,155,267
Allowance for loan losses	(109,984)	(91,887)
Net loans	15,159,795	14,063,380
Premises and equipment	123,442	126,896
Loan servicing rights, at fair value	71,013	63,841
Goodwill	1,134,568	1,134,568
Other intangible assets	28,556	34,271
Interest receivable and other assets	754,167	709,154
Total assets	21,498,341	19,280,873
Deposits:
Noninterest-bearing	3,809,252	3,725,779
Interest-bearing	11,784,030	9,917,024
Total deposits	15,593,282	13,642,803
Collateralized customer deposits	382,687	415,236
Short-term borrowings	2,035,000	2,000,000
Long-term borrowings	426,002	372,882
Interest payable and other liabilities	225,110	181,203
Total liabilities	18,662,081	16,612,124
Shareholders' equity
Preferred stock	0	0
Common stock	71,460	71,207
Additional paid-in capital	2,209,761	2,203,637
Retained earnings	616,149	419,403
Accumulated other comprehensive loss	(61,110)	(25,498)
Total shareholders' equity	2,836,260	2,668,749
Total liabilities and shareholders' equity	$ 21,498,341	$ 19,280,873