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Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Summary of Supplemental Cash Flow Information
The following table summarizes supplemental cash flow information:
Years Ended December 31,
(dollars in thousands)202020192018
Cash payments:
Interest$70,043 $127,713 $91,813 
Income taxes (net of refunds)24,436 5,494 (2,505)
Noncash Investing and Financing Activities:
Securities transferred from held-to-maturity to available-for-sale— 381,992 447,026 
Securities transferred from available-for-sale to held-to-maturity— — 323,990 
Transfer of premises and equipment to assets held for sale16,661 2,689 9,634 
Operating lease right-of-use assets obtained in exchange for lease obligations(116)113,498 — 
Finance lease right-of-use assets obtained in exchange for lease obligations5,225 7,871 — 
Summary of Common Shares Issued and Resultant Value of Total Shareholders' Equity
The following table summarizes the common shares issued and resultant value of total shareholders’ equity associated with acquisitions:
(dollars and shares in thousands)Shares of
Common Stock		Total
Shareholders'
Equity
Year Ended December 31, 2018
Acquisition of Klein22,772 $406,474 
Schedule of Composition of Loans and Impact of Adoption The composition of loans by portfolio segment as of December 31, 2019 follows:
(dollars in thousands)December 31, 2019
Statement
Balance		Segment
Portfolio
Reclassifications		December 31, 2019
After
Reclassifications
Loans:
Commercial$2,890,296 $(75,142)$2,815,154 
Commercial real estate5,166,792 (277,539)4,889,253 
BBCCN/A352,681 352,681 
Residential real estate2,334,289 — 2,334,289 
Consumer1,726,147 (1,726,147)N/A
IndirectN/A935,584 935,584 
DirectN/A228,524 228,524 
Home equityN/A562,039 562,039 
Total$12,117,524 $— $12,117,524 
Allowance:
Commercial$(22,585)$1,226 $(21,359)
Commercial real estate(21,588)1,053 (20,535)
BBCCN/A(2,279)(2,279)
Residential real estate(2,299)— (2,299)
Consumer(8,147)8,147 N/A
IndirectN/A(5,319)(5,319)
DirectN/A(1,863)(1,863)
Home equityN/A(965)(965)
Total$(54,619)$— $(54,619)
The following table illustrates the impact of adoption of the ASU:
(dollars in thousands)December 31, 2019
After
Reclassifications		Impact of
ASC 326
Adoption		January 1, 2020
Post-ASC 326
Adoption
Assets:
Loans, net of unearned income:
Commercial$2,815,154 $2,679 $2,817,833 
Commercial real estate4,889,253 1,637 4,890,890 
BBCC352,681 33 352,714 
Residential real estate2,334,289 105 2,334,394 
Indirect935,584 10 935,594 
Direct228,524 2 228,526 
Home equity562,039 12 562,051 
Total12,117,524 4,478 12,122,002 
Allowance:
Commercial(21,359)(7,150)(28,509)
Commercial real estate(20,535)(25,548)(46,083)
BBCC(2,279)(3,702)(5,981)
Residential real estate(2,299)(6,986)(9,285)
Indirect(5,319)1,669 (3,650)
Direct(1,863)1,059 (804)
Home equity(965)(689)(1,654)
Total allowance for credit losses on loans(54,619)(41,347)(95,966)
Net loans$12,062,905 $(36,869)$12,026,036 
Net deferred tax assets$29,705 $10,268 $39,973 
Liabilities:
Allowance for credit losses on unfunded loan commitments$2,656 $4,549 $7,205 
Shareholders' equity:
Retained earnings$682,185 $(31,150)$651,035 
The composition of loans by portfolio segment as of December 31, 2020 follows:
December 31, 2020SegmentDecember 31, 2020
StatementPortfolioAfter
(dollars in thousands)BalanceReclassificationsReclassifications
Loans:
Commercial$3,956,422 $(198,722)$3,757,700 
Commercial real estate5,946,512 (171,701)5,774,811 
BBCCN/A370,423 370,423 
Residential real estate2,248,422 — 2,248,422 
Consumer1,635,123 (1,635,123)N/A
IndirectN/A913,902 913,902 
DirectN/A164,807 164,807 
Home equityN/A556,414 556,414 
Total$13,786,479 $— $13,786,479