Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash and due from banks	$ 376,719	$ 327,440
Overnight investments	1,107,844	797,406
Investment in marketable equity securities (cost of $59,262 at December 31, 2019 and $73,809 at December 31, 2018)	82,333	92,599
Investment securities available for sale	7,059,674	4,557,110
Investment securities held to maturity	30,996	2,184,653
Loans held for sale	67,869	45,505
Loans	28,881,496	25,523,276
Less allowance for loan and lease losses	(225,141)	(223,712)
Net Loans and Leases	28,656,355	25,299,564
Premises and equipment	1,244,396	1,204,179
Other Real Estate	46,591	48,030
Income earned not collected	123,154	109,903
Goodwill	349,398	236,347
Intangible Assets, Net (Excluding Goodwill)	68,276	72,298
Other assets	610,891	433,595
Total assets	39,824,496	35,408,629
Deposits [Abstract]
Noninterest-bearing	12,926,796	11,882,670
Interest-bearing	21,504,440	18,789,790
Total deposits	34,431,236	30,672,460
Securities Sold under Agreements to Repurchase	442,956	543,936
Federal Home Loan Bank Advances	572,185	193,556
Subordinated Debt	163,412	140,741
Other Borrowings	148,318	13,921
FDIC shared-loss payable	112,395	105,618
Other liabilities	367,810	249,443
Total liabilities	36,238,312	31,919,675
Shareholders' Equity
Preferred stock - $0.01 par value (10,000,000 shares authorized; no shares issued and outstanding at December 31, 2019 and December 31, 2018)	0	0
Surplus	44,081	493,962
Retained earnings	3,658,197	3,218,551
Accumulated other comprehensive loss	(126,723)	(235,187)
Total shareholders' equity	3,586,184	3,488,954
Total liabilities and shareholders' equity	39,824,496	35,408,629
Class A Common Stock
Shareholders' Equity
Common stock	9,624	10,623
Class B Common Stock
Shareholders' Equity
Common stock	$ 1,005	$ 1,005