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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	$ 13,601,846	$ 13,786,479
Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	13,601,846	13,786,479
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	3,391,769	3,956,422
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	3,200,212	3,757,700
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,380,674	5,946,512
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,221,484	5,774,811
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	350,747	370,423
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	2,255,289	2,248,422
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	2,255,289	2,248,422
Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	873,139	913,902
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	873,139	913,902
Direct
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	140,385	164,807
Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	140,385	164,807
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	560,590	556,414
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	560,590	556,414
Total Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	37,862	69,967
Total Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	4,943	5,741
Total Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	8,724	28,287
Total Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,018	1,837
Total Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	15,191	22,601
Total Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	5,309	6,674
Total Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,008	1,712
Total Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,669	3,115
30-59 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	18,413	23,447
30-59 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	2,723	2,977
30-59 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,402	887
30-59 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	747	894
30-59 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	8,273	11,639
30-59 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	3,888	5,222
30-59 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	687	753
30-59 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	693	1,075
60-89 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	4,648	6,840
60-89 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	617	664
60-89 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	280	128
60-89 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	162	882
60-89 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	2,364	3,296
60-89 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	867	960
60-89 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	159	533
60-89 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	199	377
Past Due 90 Days or More | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	14,801	39,680
Past Due 90 Days or More | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,603	2,100
Past Due 90 Days or More | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	7,042	27,272
Past Due 90 Days or More | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	109	61
Past Due 90 Days or More | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	4,554	7,666
Past Due 90 Days or More | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	554	492
Past Due 90 Days or More | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	162	426
Past Due 90 Days or More | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	777	1,663
Current | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	13,563,984	13,716,512
Current | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	3,195,269	3,751,959
Current | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,212,760	5,746,524
Current | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	349,729	368,586
Current | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	2,240,098	2,225,821
Current | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	867,830	907,228
Current | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	139,377	163,095
Current | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	$ 558,921	$ 553,299

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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