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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Activity for Goodwill and Other Intangible Assets The following table presents activity for goodwill and other intangible assets (in thousands):
 GoodwillCore deposit and
other intangible assets		Total
Balance at December 31, 2020$1,819,811 $42,336 $1,862,147 
Amortization— (8,518)(8,518)
Balance at December 31, 2021$1,819,811 $33,819 $1,853,630 
Gross Carrying Amount and Accumulated Amortization for the Core Deposit and Other Intangible Assets The following table presents the gross carrying amount and accumulated amortization for the core deposit and other intangible assets (in thousands):
 December 31, 2021December 31, 2020
Gross carrying amount$108,665 $108,665 
Accumulated amortization(74,846)(66,329)
Net book value$33,819 $42,336 
Supplemental Cash Flow Information
Cash Equivalents and Cash Flows — Cash on hand, cash items in process of collection, amounts due from banks, Federal funds sold, short-term discount notes and securities purchased under agreements to resell, with original maturities within ninety days, are included in cash and cash equivalents.  The following supplemental cash flow information addresses certain cash payments and noncash transactions for each of the years in the three-year period ended December 31, 2021 as follows (in thousands):
 For the years ended December 31,
 202120202019
Cash Payments: 
Interest$110,119 $215,888 $287,272 
Income taxes paid108,304 110,798 86,960 
Noncash Transactions:   
Loans charged-off to the allowance for credit losses54,996 49,333 28,467 
Loans foreclosed upon with repossessions transferred to other real estate1,098 3,436 17,937 
Loans foreclosed upon with repossessions transferred to other repossessed assets— 25 93 
Other real estate sales financed— — 871 
Fixed assets transferred to other real estate— — 8,182 
Available-for-sale securities transferred to held-to-maturity portfolio— 873,613 — 
Right-of-use assets recognized in the period in exchange for lease obligations(1)
17,642 15,820 90,927 
(1) Includes $79.9 million recognized upon initial adoption of ASU 2016-02 on January 1, 2019.
Basic and Diluted Earnings Per Share Calculations
The following is a summary of the basic and diluted earnings per share calculation for each of the years in the three-year period ended December 31, 2021 (dollars in thousands except earnings per share):

 December 31, 2021December 31, 2020December 31, 2019
Basic earnings per common share calculation:   
Numerator - Net income available to common shareholders
$512,131 $304,725 $400,881 
Denominator – Weighted average common shares outstanding
75,468,339 75,376,489 76,364,303 
Basic net income per common share$6.79 $4.04 $5.25 
Diluted earnings per common share calculation:   
Numerator - Net income available to common shareholders
$512,131 $304,725 $400,881 
Denominator – Weighted average common shares outstanding
75,468,339 75,376,489 76,364,303 
Dilutive shares contingently issuable458,808 277,896 399,600 
Weighted average diluted common shares outstanding75,927,147 75,654,385 76,763,903 
Diluted net income per common share$6.75 $4.03 $5.22