Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income:
Loans and leases	$ 924,294	$ 819,094	$ 657,097
Investment securities	90,557	64,368	47,345
Deposits in financial institutions	1,061	476	333
Total interest income	1,015,912	883,938	704,775
Interest expense:
Deposits	31,512	41,503	27,332
Borrowings	2,259	554	496
Subordinated debentures	20,850	18,535	14,570
Total interest expense	54,621	60,592	42,398
Net interest income	961,291	823,346	662,377
Provision for credit losses	65,729	45,481	11,499
Net interest income after provision for credit losses	895,562	777,865	650,878
Noninterest income:
Service charges on deposit accounts	14,534	11,688	11,233
Other commissions and fees	47,126	31,586	18,602
Leased equipment income	33,919	24,023	16,669
Gain on sale of loans and leases	909	373	601
Gain on sale of securities	9,485	3,744	4,841
FDIC loss sharing expense, net	(8,917)	(18,246)	(31,730)
Other income	15,419	31,142	21,971
Total noninterest income	112,475	84,310	42,187
Noninterest expense:
Compensation	251,913	203,914	165,499
Occupancy	48,911	44,144	40,606
Data processing	24,356	18,617	14,618
Other professional services	16,478	13,760	11,234
Insurance and assessments	18,364	16,996	10,907
Intangible asset amortization	16,517	9,410	6,268
Leased equipment depreciation	20,899	13,603	9,159
Foreclosed Real Estate (Income) Expense	1,881	(668)
Foreclosed assets expense (income), net			5,401
Acquisition, integration and reorganization costs	200	21,247	101,016
Other expense	50,582	41,016	40,884
Total noninterest expense	450,101	382,039	405,592
Earnings from continuing operations before taxes	557,936	480,136	287,473
Income tax expense	(205,770)	(180,517)	(117,005)
Net earnings from continuing operations	352,166	299,619	170,468
Loss from discontinued operations before taxes	0	0	(2,677)
Income tax benefit	0	0	1,114
Net loss from discontinued operations	0	0	(1,563)
Net earnings	$ 352,166	$ 299,619	$ 168,905
Net earnings from continuing operations (usd per share)	$ 2.90	$ 2.79	$ 1.94
Basic income per share (usd per share)	2.90	2.79	1.92
Net earnings from continuing operations (usd per share)	2.90	2.79	1.94
Diluted income per share (usd per share)	2.90	2.79	1.92
Dividends declared per share (usd per share)	$ 2	$ 2.00	$ 1.25