Condensed Consolidated Statements of Income - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest Income
Loans	$ 138,228,000	$ 159,978,000	$ 426,833,000	$ 462,462,000
Investment securities	19,082,000	19,452,000	59,706,000	53,463,000
Other short-term investments	1,775,000	2,533,000	4,817,000	6,210,000
Total interest income	159,085,000	181,963,000	491,356,000	522,135,000
Interest Expense
Deposits	6,837,000	21,754,000	34,031,000	57,672,000
Borrowed funds	6,021,000	5,639,000	15,018,000	13,649,000
Senior and subordinated debt	3,498,000	3,783,000	10,769,000	10,691,000
Total interest expense	16,356,000	31,176,000	59,818,000	82,012,000
Net interest income	142,729,000	150,787,000	431,538,000	440,123,000
Provision for loan losses	15,927,000	12,498,000	88,108,000	34,433,000
Net interest income after provision for loan losses	126,802,000	138,289,000	343,430,000	405,690,000
Noninterest Income
Wealth management fees	12,837,000	12,063,000	37,140,000	35,853,000
Service charges on deposit accounts	10,342,000	13,024,000	31,248,000	36,760,000
Mortgage banking income	6,659,000	3,066,000	11,924,000	5,971,000
Card-based fees	4,472,000	4,694,000	11,620,000	13,621,000
Other service charges, commissions, and fees	2,823,000	3,023,000	7,583,000	8,417,000
Capital market products income	886,000	4,161,000	6,302,000	7,594,000
Swap termination costs	(14,285,000)	0	(14,285,000)	0
Net securities gains	14,328,000	0	13,323,000	0
Other income	2,523,000	2,920,000	8,083,000	8,167,000
Total noninterest income	40,585,000	42,951,000	112,938,000	116,383,000
Noninterest Expense
Salaries and employee benefits	64,734,000	61,481,000	191,265,000	177,546,000
Net occupancy and equipment expense	13,736,000	12,787,000	43,079,000	38,878,000
Technology and related costs	10,416,000	6,960,000	28,817,000	20,358,000
Professional services	7,325,000	8,768,000	26,595,000	25,479,000
Net OREO expense	544,000	381,000	1,090,000	1,356,000
Other expenses	15,062,000	14,387,000	47,911,000	43,494,000
Optimization costs	18,376,000	0	18,376,000	0
Acquisition and integration related expenses	881,000	3,397,000	11,602,000	16,602,000
Delivering Excellence implementation costs	0	234,000	0	934,000
Total noninterest expense	131,074,000	108,395,000	368,735,000	324,647,000
Income before income tax expense	36,313,000	72,845,000	87,633,000	197,426,000
Income tax expense	8,690,000	18,300,000	21,340,000	49,809,000
Net income	27,623,000	54,545,000	66,293,000	147,617,000
Preferred dividends	(4,033,000)	0	(5,070,000)	0
Net income applicable to unvested restricted shares	(236,000)	(465,000)	(615,000)	(1,257,000)
Net income applicable to common shares	$ 23,354,000	$ 54,080,000	$ 60,608,000	$ 146,360,000
Per Common Share Data
Basic earnings per common share (in dollars per share)	$ 0.21	$ 0.49	$ 0.54	$ 1.36
Diluted earnings per common share (in dollars per share)	0.21	0.49	0.54	1.35
Dividends declared per common share (in dollars per share)	$ 0.14	$ 0.14	$ 0.42	$ 0.40
Weighted-average common shares outstanding (in Shares)	113,160	109,281	112,079	107,852
Weighted-average diluted common shares outstanding (in Shares)	113,436	109,662	112,401	108,246