Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest income:
Interest and fees on loans	$ 122,370	$ 121,395	$ 143,181
Interest on debt securities:
Taxable	8,842	8,711	8,325
Nontaxable	1,215	1,188	1,209
Interest on interest-bearing deposits	211	187	210
Dividends on equity securities	141	273	364
Total interest income	132,779	131,754	153,289
Interest expense:
Interest-bearing transaction accounts	1,149	653	461
Money market accounts	2,993	2,716	3,080
Savings accounts	219	201	225
Certificates of deposit:
$100 and over	4,664	5,281	5,554
Other	1,387	1,636	1,822
Subordinated debentures	1,248	1,322	3,019
Federal Home Loan Bank advances	127	1,799	2,938
Notes payable and other borrowings	582	778	1,038
Total interest expense	12,369	14,386	18,137
Net interest income	120,410	117,368	135,152
Provision (provision reversal) for portfolio loan losses	4,872	4,409	(642)
Provision (provision reversal) for purchased credit impaired loan losses	(4,414)	1,083	4,974
Net interest income after provision for loan losses	119,952	111,876	130,820
Noninterest income:
Wealth management revenue	7,007	6,942	7,118
Service charges on deposit accounts	7,923	7,181	6,825
Other service charges and fee income	3,241	2,953	2,717
Gain on sale of branches	0	0	1,044
Gain on sale of other real estate	142	1,531	3,363
Gain on state tax credits, net	2,720	2,252	2,503
Gain on sale of investment securities	23	0	1,295
Change in FDIC loss share receivable	(5,030)	(9,307)	(18,173)
Miscellaneous income	4,649	5,079	3,207
Total noninterest income	20,675	16,631	9,899
Noninterest expense:
Employee compensation and benefits	46,095	47,232	47,278
Occupancy	6,573	6,527	7,277
Expense recorded related to Clawback Liability	760	1,201	951
FDIC Loss Share Termination	2,436	0	0
Data processing	4,339	4,481	4,137
FDIC and other insurance	2,790	2,884	3,244
Loan legal and other real estate expense	1,812	3,936	4,496
Professional fees	3,465	3,825	4,876
FHLB prepayment penalty	0	2,936	2,590
Other	13,956	14,441	15,790
Total noninterest expense	82,226	87,463	90,639
Income before income tax expense	58,401	41,044	50,080
Income tax expense	19,951	13,871	16,976
Net income	$ 38,450	$ 27,173	$ 33,104
Earnings per common share
Basic (usd per share)	$ 1.92	$ 1.38	$ 1.78
Diluted (usd per share)	$ 1.89	$ 1.35	$ 1.73