Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 353,908	$ 360,375
Interest-bearing deposits in other banks	698,924	333,642
Investment securities, at fair value (amortized cost: $4,014,397 as of March 31, 2020 and $4,080,663 as of December 31, 2019)	4,058,457	4,075,644
Loans held for sale	8,180	904
Loans and leases	13,380,270	13,211,650
Less: allowance for credit losses	166,013	130,530
Net loans and leases	13,214,257	13,081,120
Premises and equipment, net	321,254	316,885
Other real estate owned and repossessed personal property	238	319
Accrued interest receivable	43,552	45,239
Bank-owned life insurance	455,226	453,873
Goodwill	995,492	995,492
Mortgage servicing rights	11,979	12,668
Other assets	594,424	490,573
Total assets	20,755,891	20,166,734
Deposits:
Interest-bearing	11,274,463	10,564,922
Noninterest-bearing	5,745,539	5,880,072
Total deposits	17,020,002	16,444,994
Short-term borrowings	400,000	400,000
Long-term borrowings	200,019	200,019
Retirement benefits payable	138,396	138,222
Other liabilities	332,789	343,241
Total liabilities	18,091,206	17,526,476
Commitments and contingent liabilities (Note 13)
Stockholders' equity
Common stock ($0.01 par value; authorized 300,000,000 shares; issued/outstanding: 140,092,172 / 129,827,968 as of March 31, 2020; issued/outstanding: 139,917,150 / 129,928,479 as of December 31, 2019)	1,401	1,399
Additional paid-in capital	2,506,477	2,503,677
Retained earnings	429,323	437,072
Accumulated other comprehensive income (loss), net	4,129	(31,749)
Treasury stock (10,264,204 shares as of March 31, 2020 and 9,988,671 shares as of December 31, 2019)	(276,645)	(270,141)
Total stockholders' equity	2,664,685	2,640,258
Total liabilities and stockholders' equity	$ 20,755,891	$ 20,166,734