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Quarterly Financial Results (unaudited) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
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, 2021
Dec. 31, 2020
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]                              
Interest income $ 259,193,000 $ 260,868,000 $ 259,236,000 $ 251,917,000 $ 257,047,000 $ 249,188,000 $ 251,738,000 $ 263,069,000 $ 268,453,000 $ 275,749,000 $ 265,851,000 $ 257,883,000 $ 1,031,214,000 $ 1,021,042,000 $ 1,067,936,000
Net interest income 238,763,000 237,543,000 233,225,000 222,870,000 220,985,000 206,594,000 200,657,000 193,552,000 194,172,000 195,806,000 188,918,000 187,246,000 932,401,000 821,788,000 766,142,000
Provision for credit losses 2,675,000 3,382,000 2,834,000 7,235,000 9,180,000 16,758,000 72,832,000 105,045,000 4,644,000 8,260,000 7,195,000 7,184,000 16,126,000 203,815,000 27,283,000
Income (Loss) from Continuing Operations before Income Taxes, Domestic 166,394,000 169,405,000 162,458,000 153,648,000 133,944,000 137,049,000 73,674,000 26,691,000 118,520,000 137,224,000 124,719,000 117,074,000 651,905,000 371,358,000 497,537,000
Net income 133,528,000 136,577,000 131,790,000 125,428,000 110,876,000 110,645,000 62,444,000 28,356,000         527,323,000 312,321,000 400,881,000
Net income available to common shareholders $ 129,730,000 $ 132,779,000 $ 127,992,000 $ 121,630,000 $ 107,078,000 $ 106,847,000 $ 62,444,000 $ 28,356,000 $ 96,079,000 $ 110,521,000 $ 100,321,000 $ 93,960,000 $ 512,131,000 $ 304,725,000 $ 400,881,000
Basic net income per common share (in dollars per share) $ 1.72 $ 1.76 $ 1.70 $ 1.61 $ 1.42 $ 1.42 $ 0.83 $ 0.37 $ 1.26 $ 1.45 $ 1.31 $ 1.22 $ 6.79 $ 4.04 $ 5.25
Diluted net income per common share (in dollars per share) $ 1.71 $ 1.75 $ 1.69 $ 1.61 $ 1.42 $ 1.42 $ 0.83 $ 0.37 $ 1.26 $ 1.44 $ 1.31 $ 1.22 $ 6.75 $ 4.03 $ 5.22