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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2022
Accounting Policies [Abstract]  
Supplemental Cash Flow Information Cash Flow Information — Supplemental cash flow information addressing certain cash and noncash transactions for the nine months ended September 30, 2022 and 2021 was as follows (in thousands):
 For the nine months ended
September 30,
 20222021
Cash Transactions:  
Interest paid$114,326 $90,651 
Income taxes paid, net115,090 88,614 
Operating lease payments12,255 10,878
Noncash Transactions:  
Loans charged-off to the allowance for credit losses33,384 39,319 
Loans foreclosed upon and transferred to other real estate owned65 798 
Available-for-sale securities transferred to held-to-maturity portfolio1,059,737 — 
Right-of-use asset recognized during the period in exchange for lease obligations31,333 8,745 
Basic and Diluted Earnings Per Share Calculations The following is a summary of the basic and diluted net income per common share calculations for the three and nine months ended September 30, 2022 and 2021 (in thousands, except per share data):
 Three months ended
September 30,		Nine months ended
September 30,
 2022202120222021
Basic net income per common share calculation:  
Numerator - Net income available to common shareholders
$144,860 $132,779 $411,501 $382,401 
Denominator - Weighted average common shares outstanding
75,762 75,494 75,723 75,450 
Basic net income per common share$1.91 $1.76 $5.43 $5.07 
Diluted net income per common share calculation:  
Numerator - Net income available to common shareholders
$144,860 $132,779 $411,501 $382,401 
Denominator - Weighted average common shares outstanding
75,762 75,494 75,723 75,450 
Dilutive common shares contingently issuable217 342 222 311 
Weighted average diluted common shares outstanding75,979 75,836 75,945 75,761 
Diluted net income per common share$1.91 $1.75 $5.42 $5.05