Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest income:
Loans and leases	$ 431,491	$ 373,234	$ 339,936
Investment securities	23,713	33,209	25,153
Other	8,535	11,508	7,761
Total interest income	463,739	417,951	372,850
Interest expense:
Deposits	141,464	110,808	67,582
FHLB advances	26,519	31,043	21,130
Subordinated debt	6,983	6,737	6,739
Federal funds purchased and other borrowings	11,463	11,486	10,056
Total interest expense	186,429	160,074	105,507
Net interest income	277,310	257,877	267,343
Provision for loan and lease losses	24,227	5,642	6,768
Net interest income after provision for loan and lease losses	253,083	252,235	260,575
Non-interest income:
Revenue from contracts with customers	46,720	43,239	55,961
Commercial lease income	12,051	5,354	647
Bank-owned life insurance	7,272	7,620	7,219
Mortgage warehouse transactional fees	7,128	7,158	9,345
Gain (loss) on sale of SBA and other loans	2,770	3,294	4,223
Mortgage banking income	66	606	875
Loss upon acquisition of interest-only GNMA securities	(7,476)	0	0
Impairment loss on investment securities	0	0	(12,934)
Gain (loss) on sale of investment securities	1,001	(18,659)	8,800
Unrealized gain (loss) on investment securities	1,299	(1,634)	0
Other	15,071	16,740	9,187
Total non-interest income	80,938	58,998	78,910
Non-interest expense:
Salaries and employee benefits	107,632	104,841	95,518
Technology, communication and bank operations	43,481	44,454	45,885
Professional services	25,109	20,237	28,051
Occupancy	13,098	11,809	11,161
Commercial lease depreciation	9,473	4,388	522
FDIC assessments, non-income taxes, and regulatory fees	5,861	8,642	7,906
Provision for operating losses	9,638	5,616	6,435
Advertising and promotion	4,044	2,446	1,470
Merger and acquisition related expenses	100	4,391	410
Loan workout	1,687	2,183	2,366
Other real estate owned	398	449	570
Other	11,380	10,723	15,312
Total non-interest expense	231,901	220,179	215,606
Income before income tax expense	102,120	91,054	123,879
Income tax expense	22,793	19,359	45,042
Net income	79,327	71,695	78,837
Preferred stock dividends	14,459	14,459	14,459
Net income available to common shareholders	$ 64,868	$ 57,236	$ 64,378
Basic earnings per common share (usd per share)	$ 2.08	$ 1.81	$ 2.10
Diluted earnings per common share (usd per share)	$ 2.05	$ 1.78	$ 1.97
Interchange and card revenue
Non-interest income:
Revenue from contracts with customers	$ 28,941	$ 30,695	$ 41,509
Deposit fees
Non-interest income:
Revenue from contracts with customers	$ 12,815	$ 7,824	$ 10,039