Condensed Consolidated Statements of Income - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest Income
Loans	$ 136,939,000	$ 138,228,000	$ 406,817,000	$ 426,833,000
Investment securities	15,659,000	19,082,000	47,583,000	59,706,000
Other short-term investments	2,074,000	1,775,000	5,422,000	4,817,000
Total interest income	154,672,000	159,085,000	459,822,000	491,356,000
Interest Expense
Deposits	2,863,000	6,837,000	9,451,000	34,031,000
Borrowed funds	3,146,000	6,021,000	9,365,000	15,018,000
Senior and subordinated debt	3,467,000	3,498,000	10,407,000	10,769,000
Total interest expense	9,476,000	16,356,000	29,223,000	59,818,000
Net interest income	145,196,000	142,729,000	430,599,000	431,538,000
Provision for loan losses	0	15,927,000	6,098,000	88,108,000
Net interest income after provision for loan losses	145,196,000	126,802,000	424,501,000	343,430,000
Noninterest Income
Wealth management fees	14,820,000	12,837,000	43,524,000	37,140,000
Service charges on deposit accounts	11,496,000	10,342,000	32,254,000	31,248,000
Mortgage banking income	6,664,000	6,659,000	23,600,000	11,924,000
Card-based fees	4,992,000	4,472,000	14,312,000	11,620,000
Capital market products income	1,333,000	886,000	5,376,000	6,302,000
Other service charges, commissions, and fees	2,832,000	2,823,000	8,416,000	7,583,000
Swap termination costs	0	(14,285,000)	0	(14,285,000)
Net securities gains	0	14,328,000	0	13,323,000
Other income	3,043,000	2,523,000	9,771,000	8,083,000
Total noninterest income	45,180,000	40,585,000	137,253,000	112,938,000
Noninterest Expense
Salaries and employee benefits	62,427,000	64,734,000	193,039,000	191,265,000
Net occupancy and equipment expense	14,198,000	13,736,000	42,604,000	43,079,000
Technology and related costs	10,742,000	10,416,000	31,479,000	28,817,000
Professional services	6,991,000	7,325,000	22,618,000	26,595,000
Net OREO expense	(4,000)	544,000	745,000	1,090,000
Other expenses	18,784,000	15,062,000	52,923,000	47,911,000
Acquisition and integration related expenses	2,916,000	881,000	10,934,000	11,602,000
Optimization costs	0	18,376,000	1,556,000	18,376,000
Total noninterest expense	116,054,000	131,074,000	355,898,000	368,735,000
Income before income tax expense	74,322,000	36,313,000	205,856,000	87,633,000
Income tax expense	19,459,000	8,690,000	54,849,000	21,340,000
Net income	54,863,000	27,623,000	151,007,000	66,293,000
Preferred dividends	(4,033,000)	(4,033,000)	(12,101,000)	(5,070,000)
Net income applicable to unvested restricted shares	(517,000)	(236,000)	(1,524,000)	(615,000)
Net income applicable to common shareholders	50,313,000	23,354,000	137,382,000	60,608,000
Net income applicable to common shareholders	$ 50,313,000	$ 23,354,000	$ 137,382,000	$ 60,608,000
Per Common Share Data
Basic earnings per common share (in dollars per share)	$ 0.45	$ 0.21	$ 1.22	$ 0.54
Diluted earnings per common share (in dollars per share)	0.44	0.21	1.21	0.54
Dividends declared per common share (in dollars per share)	$ 0.14	$ 0.14	$ 0.42	$ 0.42
Weighted-average common shares outstanding (in Shares)	112,898	113,160	112,953	112,079
Weighted-average diluted common shares outstanding (in Shares)	113,776	113,436	113,742	112,401