Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest and dividend income
Loans, including fees	$ 296,996	$ 241,556	$ 180,761
Securities	79,527	20,263	5,158
Other interest-earning assets	8,449	4,519	2,220
Total interest and dividend income	384,972	266,338	188,139
Interest expense
Deposits	40,220	25,783	24,411
Federal Home Loan Bank advances	5,717	2,120	527
Securities sold under repurchase agreements	818	18	1
Notes payable and other interest-bearing liabilities	12,744	14,700	7,923
Total interest expense	59,499	42,621	32,862
Net interest income	325,473	223,717	155,277
Provision for loan and lease losses	5,271	7,469	10,976
Net interest income after provision for loan and lease losses	320,202	216,248	144,301
Noninterest income
Customer service fees	5,147	4,057	1,490
Loan servicing income	5,385	2,974	4,199
Income from bank owned life insurance	2,341	1,076	224
Net gain on sale of securities available-for-sale	29,405	3,258	1,183
Net gain on sale of loans	35,895	37,211	19,828
Net revenue on mortgage banking activities	167,024	144,685	95,430
Advisory service fees	1,507	9,868	12,904
Loan brokerage income	4,519	3,140	8,674
Gain on sale of building	0	9,919	0
Gain on sale of branches	0	163	456
Gain on sale of subsidiary	3,694	0	0
Gain on sale of business unit	2,629	0	0
Other income	14,334	3,868	1,249
Total noninterest income	271,880	220,219	145,637
Noninterest expense
Salaries and employee benefits	257,918	213,114	162,879
Occupancy and equipment	49,018	41,405	33,443
Professional fees	31,293	20,193	19,247
Outside service fees	13,052	8,831	6,372
Data processing	10,833	8,184	5,231
Advertising	10,740	6,156	5,016
Regulatory assessments	8,186	5,644	4,182
Loss on investments in alternative energy partnerships, net	31,510	0	0
Provision (reversal) for loan repurchases	(3,352)	2,326	2,808
Amortization of intangible assets	4,851	5,836	4,079
Impairment on intangible assets	690	258	48
All other expense	27,937	20,254	20,167
Total noninterest expense	442,676	332,201	263,472
Income before income taxes	149,406	104,266	26,466
Income tax expense (benefit)	33,990	42,194	(3,739)
Net income	115,416	62,072	30,205
Preferred stock dividends	19,914	9,823	3,640
Net income available to common stockholders	$ 95,502	$ 52,249	$ 26,565
Basic earnings per common share (in usd per share)	$ 1.97	$ 1.36	$ 0.91
Diluted earnings per common share (in usd per share)	$ 1.94	$ 1.34	$ 0.90
Class A Common Stock
Noninterest expense
Net income	$ 115,097	$ 62,050	$ 29,559
Preferred stock dividends	$ 19,859	$ 9,820	$ 3,562
Basic earnings per common share (in usd per share)	$ 1.97	$ 1.36	$ 0.91
Diluted earnings per common share (in usd per share)	$ 1.94	$ 1.34	$ 0.90
Class B Common Stock
Noninterest expense
Net income	$ 319	$ 22	$ 646
Preferred stock dividends	$ 55	$ 3	$ 78
Basic earnings per common share (in usd per share)	$ 1.97	$ 1.36	$ 0.91
Diluted earnings per common share (in usd per share)	$ 1.97	$ 1.36	$ 0.91