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Pay vs Performance Disclosure | 12 Months Ended
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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 PEO | Compen-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 Adjustment | PEO
2022 | 2021 | 2020
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 Year | 1,479,957 |  | 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 Year | 15,968 |  | 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 Date | 63,567 |  | 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 Adjustment | Average of Non PEOs
2022 | 2021 | 2020
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 Cost | 70,066 |  | 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 Year | 308,045 |  | 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 Year | 11,792 |  | 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 Date | 17,956 |  | 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

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