Consolidated Statements of Financial Position - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Cash and cash equivalents:
Cash and cash due from banks	$ 200,034	$ 228,527
Interest-bearing deposits with the Federal Reserve Bank and other banks and federal funds sold	392,724	267,312
Total cash and cash equivalents	592,758	495,839
Investment securities:
Carried at fair value	3,369,872	3,021,832
Held-to-maturity, at amortized cost (fair value of $575,502 and $618,672, respectively)	566,046	624,099
Total investment securities	3,935,918	3,645,931
Loans held-for-sale, at fair value	33,019	85,030
Loans	15,861,903	15,269,779
Allowance for loan losses	(115,967)	(109,984)
Net loans	15,745,936	15,159,795
Premises and equipment	123,708	123,442
Loan servicing rights, at fair value	60,658	71,013
Goodwill	1,134,568	1,134,568
Core deposit intangibles	25,835	28,556
Interest receivable and other assets	839,365	754,167
Total assets	22,491,765	21,498,341
Deposits:
Noninterest-bearing	3,925,777	3,809,252
Interest-bearing	11,953,659	11,784,030
Total deposits	15,879,436	15,593,282
Collateralized customer deposits	291,671	382,687
Short-term borrowings	2,615,000	2,035,000
Long-term borrowings	426,069	426,002
Interest payable and other liabilities	326,054	225,110
Total liabilities	19,538,230	18,662,081
Shareholders' equity
Preferred stock, none issued	0	0
Common stock issued	71,559	71,460
Additional paid-in capital	2,212,665	2,209,761
Retained earnings	699,712	616,149
Accumulated other comprehensive loss	(30,401)	(61,110)
Total shareholders' equity	2,953,535	2,836,260
Total liabilities and shareholders' equity	$ 22,491,765	$ 21,498,341