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Income Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Contingency [Line Items]                      
Current Federal Tax Expense (Benefit)                 $ 44,094 $ 40,471 $ 33,400
Current State and Local Tax Expense (Benefit)                 7,822 6,359 5,446
Current tax (benefit) expense                 51,916 46,830 38,846
Deferred Federal Income Tax Expense (Benefit)                 (12,078) 60 (291)
Deferred State and Local Income Tax Expense (Benefit)                 (1,690) 270 399
Deferred tax expense (benefit)                 (13,768) 330 108
Income tax provision $ 16,774 $ 9,949 $ 8,195 $ 3,230 $ 11,903 $ 12,378 $ 12,094 $ 10,785 38,148 47,160 38,954
Deferred tax assets:                      
Allowance for credit losses 36,906       20,489       36,906 20,489  
Deferred Tax Assets, Lease Liability 15,823       14,776       15,823 14,776  
Deferred compensation 11,658       11,079       11,658 11,079  
Stock option and restricted stock 2,599       2,016       2,599 2,016  
OREO 16       0       16 0  
Nonaccrual interest 102       112       102 112  
Deferred Tax Assets, Net operating losses and credit carryforwards 3,304       4,136       3,304 4,136  
Other (278)       (245)       (278) (245)  
Total deferred tax assets 70,686       52,853       70,686 52,853  
Deferred tax liabilities:                      
Asset purchase tax basis difference (6,590)       (7,888)       (6,590) (7,888)  
Deferred Tax Liabilities, Leasing Arrangements (14,501)       (13,415)       (14,501) (13,415)  
FHLB stock dividends (789)       (789)       (789) (789)  
Deferred loan fees (5,695)       (4,097)       (5,695) (4,097)  
deferred tax liabilities, unrealized gains on available-for-sale securities 49,837       10,091       49,837 10,091  
deferred tax liabilites, unrealized gains on equity securities (3,147)       0       (3,147) 0  
Deferred tax liabilities, purchase accounting (7,526)       (8,946)       (7,526) (8,946)  
Depreciation (2,427)       (3,152)       (2,427) (3,152)  
Deferred Tax Liabilities, Derivatives (7,591)       (3,452)       (7,591) (3,452)  
Deferred Tax Liabilities, Other (112)       (100)       (112) (100)  
Total deferred tax liabilities 98,215       51,930       98,215 51,930  
Net deferred tax liability (27,529)               (27,529)    
Net deferred tax asset         923         923  
Reconciliation of effective income tax rate with federal statutory tax rate                      
Income tax based on statutory rate                 $ 40,402 $ 50,738 $ 44,485
Income tax based on statutory rate, percent                 21.00% 21.00% 21.00%
Tax exempt instruments                 $ (5,987) $ (6,771) $ (6,423)
Tax exempt instrument, percent                 (3.00%) (3.00%) (3.00%)
Bank owned life insurance proceeds                 $ (1,348) $ (1,963) $ (1,261)
Life insurance proceeds, percent                 (1.00%) (1.00%) (1.00%)
State income tax, net of federal benefit                 $ 4,844 $ 5,134 $ 4,931
State income tax, net of federal benefit, Percent                 3.00% 2.00% 2.00%
Other, net                 $ 237 $ 22 $ (2,778)
Other, net, percent                 0.00% 1.00% (1.00%)
Income tax provision $ 16,774 $ 9,949 $ 8,195 $ 3,230 $ 11,903 $ 12,378 $ 12,094 $ 10,785 $ 38,148 $ 47,160 $ 38,954
Income tax provision (benefit), percent                 20.00% 20.00% 18.00%