Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest income:
Loans and leases	$ 203,781	$ 202,097	$ 192,201	$ 405,878	$ 269,664
Investment securities	14,570	12,195	11,986	26,765	22,809
Deposits in financial institutions	104	22	176	126	250
Total interest income	218,455	214,314	204,363	432,769	292,723
Interest expense:
Deposits	11,233	10,479	7,313	21,712	8,538
Borrowings	88	235	199	323	278
Subordinated debentures	4,582	4,525	4,318	9,107	5,359
Total interest expense	15,903	15,239	11,830	31,142	14,175
Net interest income	202,552	199,075	192,533	401,627	278,548
Provision for credit losses	6,529	16,434	5,030	22,963	4,386
Net interest income after provision (negative provision) for credit losses	196,023	182,641	187,503	378,664	274,162
Non-interest income:
Service charges on deposit accounts	2,612	2,574	2,719	5,186	5,721
Other commissions and fees	7,123	5,396	5,743	12,519	7,675
Leased equipment income	5,375	5,382	5,672	10,757	5,672
Gain (loss) on sale of loans and leases	163	0	(485)	163	(379)
(Loss) gain on securities	(186)	3,275	89	3,089	4,841
FDIC loss sharing expense, net	(5,107)	(4,399)	(8,525)	(9,506)	(19,955)
Other income	9,643	8,643	3,266	18,286	9,595
Total noninterest income	19,623	20,871	8,479	40,494	13,170
Non-interest expense:
Compensation	49,033	47,737	45,081	96,770	73,708
Occupancy	10,588	10,600	11,078	21,188	18,673
Data processing	4,402	4,308	4,099	8,710	6,639
Other professional services	3,332	3,221	2,843	6,553	4,366
Insurance and assessments	4,716	3,025	3,179	7,741	4,772
Intangible asset amortization	1,502	1,501	1,677	3,003	3,041
Leased equipment depreciation	3,103	3,103	3,095	6,206	3,095
Foreclosed assets (income) expense, net	(2,340)	336	497	(2,004)	(1,364)
Acquisition, integration and reorganization costs	900	2,000	86,242	2,900	88,442
Other expense	10,040	8,529	11,409	18,569	17,992
Total noninterest expense	85,276	84,360	169,200	169,636	219,364
Earnings from continuing operations before taxes	130,370	119,152	26,782	249,522	67,968
Income tax expense	(45,287)	(46,073)	(15,552)	(91,360)	(30,833)
Net earnings from continuing operations	85,083	73,079	11,230	158,162	37,135
Loss from discontinued operations before taxes	0	0	(1,151)	0	(2,564)
Income tax benefit	0	0	476	0	1,064
Net loss from discontinued operations	0	0	(675)	0	(1,500)
Net earnings	$ 85,083	$ 73,079	$ 10,555	$ 158,162	$ 35,635
Earnings Per Share, Basic [Abstract]
Net earnings from continuing operations (usd per share)	$ 0.83	$ 0.71	$ 0.11	$ 1.54	$ 0.51
Net earnings (usd per share)	0.83	0.71	0.10	1.54	0.49
Earnings Per Share, Diluted [Abstract]
Net earnings from continuing operations (usd per share)	0.83	0.71	0.11	1.54	0.51
Net earnings (usd per share)	0.83	0.71	0.10	1.54	0.49
Dividends [Abstract]
Dividends declared per share (usd per share)	$ 0.5	$ 0.5	$ 0.25	$ 1	$ 0.50