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Pay vs Performance Disclosure
 12 Months Ended
Dec. 31, 2022
USD ($)
dollarsPerShare
Dec. 31, 2021
USD ($)
dollarsPerShare
Dec. 31, 2020
USD ($)
dollarsPerShare
Pay vs Performance Disclosure [Table]      
Pay vs Performance [Table Text Block]
Year Summary Compen-sation Table Total for PEOCompen-sation Actually Paid to PEO
Average Summary Compen-sation Table Total for Non-PEO Named Executive Officers(1)
Average Compen-sation Actually Paid to Non-PEO Named Executive Officers(1)
Value of Initial Fixed $100 Investment Based On:
Net Income (in millions)(3)
Earnings per Share (diluted)(3)
Total Shareholder Return
Peer Group(2)
2022$4,418,281 $3,272,186 $1,853,466 $1,606,230 $98$116$140.9$4.39
2021$5,491,034 $6,808,025 $1,960,009 $2,559,884 $126$125$176.7$5.52
2020$3,609,296 $3,163,054 $1,887,526 $1,767,368 $87$91$132.2$4.18
    
Company Selected Measure Name Earnings Per Share    
Peer Group Issuers, Footnote [Text Block] Peer group is the KBW NASDAQ Regional Bank Index, which is the peer group used for our performance graph in our Form 10-K.    
PEO Total Compensation Amount $ 4,418,281 $ 5,491,034 $ 3,609,296
PEO Actually Paid Compensation Amount $ 3,272,186 6,808,025 3,163,054
Adjustment To PEO Compensation, Footnote [Text Block] Includes Mr. Pozez, Mr. Levingston, Mr. Marquez, Mr. Rheaume and Ms. Williams in all three years.
Pay versus Performance AdjustmentPEO
202220212020
SCT Total Compensation$4,418,281$5,491,034$3,609,296
Less: Change in Pension Value(7,039)(219)(38,842)
Add: Actuarially Determined Service Cost(72,645)(85,621)(39,675)
Less: Values Reported in the SCT for Stock Awards Granted in the Covered Year(1,902,462)(1,903,140)(1,722,851)
Add: Fair Values of the Stock Awards Granted in the Covered Year1,479,957 2,309,113 1,557,901 
Change in Fair Value of Unvested Stock Award from Prior Years(690,887)816,273 (148,555)
Change in Fair Value of Unvested Stock Award from Prior Years that Vest in Covered Year15,968 144,812 1,779 
Less: Fair Value of Stock Awards Forfeited During the Covered Year(32,554)(7,228)(76,933)
Add: Dividends on Stock Award in the Covered Fiscal Year Before Vesting Date63,567 43,001 20,934 
Compensation Actually Paid$3,272,186$6,808,025$3,163,054
    
Non-PEO NEO Average Total Compensation Amount $ 1,853,466 1,960,009 1,887,526
Non-PEO NEO Average Compensation Actually Paid Amount $ 1,606,230 2,559,884 1,767,368
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
Pay versus Performance AdjustmentAverage of Non PEOs
202220212020
SCT Total Compensation$1,853,466$1,960,009$1,887,526
Less: Change in Pension Value(86,333)(75,121)(50,658)
Add: Actuarially Determined Service Cost70,066 62,576 41,103 
Less: Values Reported in the SCT for Stock Awards Granted in the Covered Year(395,991)(404,079)(942,683)
Add: Fair Values of the Stock Awards Granted in the Covered Year308,045 490,275 932,123 
Change in Fair Value of Unvested Stock Award from Prior Years(156,331)404,948 (84,216)
Change in Fair Value of Unvested Stock Award from Prior Years that Vest in Covered Year11,792 100,865 (6,878)
Less: Fair Value of Stock Awards Forfeited During the Covered Year(16,440)(3,345)(26,367)
Add: Dividends on Stock Award in the Covered Fiscal Year Before Vesting Date17,956 23,756 17,418 
Compensation Actually Paid$1,606,230$2,559,884$1,767,368
    
Tabular List [Table Text Block]
The following is a list of the most important financial measures, along with Earnings Per Share, used for the most recent fiscal year to link compensation actually paid to the PEO and Non-PEO named executives:
•Adjusted net income
•Net interest margin
•Earnings per share
•Relative return on average assets
•Average loans
•Relative total shareholder return
•Efficiency
    
Total Shareholder Return Amount $ 98 126 87
Peer Group Total Shareholder Return Amount 116 125 91
Net Income (Loss) $ 140,900,000 $ 176,700,000 $ 132,200,000
Company Selected Measure Amount | dollarsPerShare 4.39 5.52 4.18
Measure [Axis]: 1      
Pay vs Performance Disclosure [Table]      
Measure Name •Adjusted net income    
Non-GAAP Measure Description [Text Block] Numbers in the table are as reported. 2022 adjusted to remove one-time items, adjusted net income was $158.8 million and adjusted earnings per share was $4.95. See Non-GAAP reconciliation, section Key Factors, subsection 2022 Financial Results and Operating Highlights.    
Measure [Axis]: 2      
Pay vs Performance Disclosure [Table]      
Measure Name •Earnings per share    
Measure [Axis]: 3      
Pay vs Performance Disclosure [Table]      
Measure Name •Average loans    
Measure [Axis]: 4      
Pay vs Performance Disclosure [Table]      
Measure Name •Efficiency    
Measure [Axis]: 5      
Pay vs Performance Disclosure [Table]      
Measure Name •Net interest margin    
Measure [Axis]: 6      
Pay vs Performance Disclosure [Table]      
Measure Name •Relative return on average assets    
Measure [Axis]: 7      
Pay vs Performance Disclosure [Table]      
Measure Name •Relative total shareholder return    
PEO [Member] | Change in Pension Value [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ (7,039) $ (219) $ (38,842)
PEO [Member] | Pension Adjustments, Service Cost [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (72,645) (85,621) (39,675)
PEO [Member] | Stock Awards Adjustments [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (1,902,462) (1,903,140) (1,722,851)
PEO [Member] | Equity Awards Reported Value [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 1,479,957 2,309,113 1,557,901
PEO [Member] | Equity Awards Granted in Prior Years, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (690,887) 816,273 (148,555)
PEO [Member] | Equity Awards Granted in Prior Years, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 15,968 144,812 1,779
PEO [Member] | Equity Awards that Failed to Meet Vesting Conditions [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (32,554) (7,228) (76,933)
PEO [Member] | Equity Awards, Value of Dividends and Other Earnings Paid Adjustment [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 63,567 43,001 20,934
Non-PEO NEO [Member] | Change in Pension Value [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (86,333) (75,121) (50,658)
Non-PEO NEO [Member] | Pension Adjustments, Service Cost [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 70,066 62,576 41,103
Non-PEO NEO [Member] | Stock Awards Adjustments [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (395,991) (404,079) (942,683)
Non-PEO NEO [Member] | Equity Awards Reported Value [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 308,045 490,275 932,123
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Unvested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (156,331) 404,948 (84,216)
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Vested [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 11,792 100,865 (6,878)
Non-PEO NEO [Member] | Equity Awards that Failed to Meet Vesting Conditions [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (16,440) (3,345) (26,367)
Non-PEO NEO [Member] | Equity Awards, Value of Dividends and Other Earnings Paid Adjustment [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ 17,956 $ 23,756 $ 17,418