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Business Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Interest income $ 473,347 $ 373,795 $ 360,419
Interest expense (64,915) (51,002) (44,525)
Net interest income 408,432 322,793 315,894
Provision for loan and lease losses, net (92,672) (96,792) (56,108)
Non-interest income 124,352 82,493 80,095
Non-interest expenses (345,286) (233,244) (207,081)
Income (loss) before income taxes 94,826 75,250 132,800
Income tax expense (benefit) 20,499 21,409 48,390
Net income 74,327 53,841 84,410
Total assets 9,826,011 9,297,661 6,583,352
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Interest income 473,347 373,795 360,419
Interest expense (64,915) (51,002) (44,525)
Net interest income 408,432 322,793 315,894
Provision for loan and lease losses, net (92,672) (96,792) (56,108)
Non-interest income 124,352 82,493 80,095
Non-interest expenses (345,286) (233,244) (207,081)
Income (loss) before income taxes 94,826 75,250 132,800
Income tax expense (benefit) 20,499 21,409 48,390
Net income 74,327 53,841 84,410
Total assets 10,947,248 10,384,869 7,597,279
Operating Segments [Member] | Intersegment [Member]      
Segment Reporting Information [Line Items]      
Revenues 2,443 2,207 2,126
Expenses (2,443) 2,207 (2,126)
Elimination [Member]      
Segment Reporting Information [Line Items]      
Interest income   0  
Interest expense   0  
Net interest income   0  
Provision for loan and lease losses, net   0  
Non-interest income   0  
Non-interest expenses   0  
Revenues (2,443) (2,207) (2,126)
Expenses 2,443 2,207 2,126
Income (loss) before income taxes   0  
Income tax expense (benefit)   0  
Net income   0  
Total assets (1,121,237) (1,087,208) (1,013,927)
Banking [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Interest income 462,493 337,448 320,084
Interest expense (57,811) (36,023) (29,746)
Net interest income 404,682 301,425 290,338
Provision for loan and lease losses, net (92,237) (96,504) (55,885)
Non-interest income 87,810 47,517 53,592
Non-interest expenses (320,997) (211,755) (186,460)
Income (loss) before income taxes 81,701 42,890 103,711
Income tax expense (benefit) 15,939 16,084 40,447
Net income 65,762 26,806 63,264
Total assets 8,478,326 7,486,314 5,863,067
Banking [Member] | Operating Segments [Member] | Intersegment [Member]      
Segment Reporting Information [Line Items]      
Revenues 2,443 2,207 2,126
Expenses 0 0 0
Wealth Management [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Interest income 59 69 46
Interest expense 0 0 0
Net interest income 59 69 46
Provision for loan and lease losses, net 0 0 0
Non-interest income 32,043 26,649 26,457
Non-interest expenses (20,240) (17,163) (16,440)
Income (loss) before income taxes 10,698 8,903 9,275
Income tax expense (benefit) 4,506 3,339 3,617
Net income 6,192 5,564 5,658
Total assets 32,893 33,369 25,757
Wealth Management [Member] | Operating Segments [Member] | Intersegment [Member]      
Segment Reporting Information [Line Items]      
Revenues 0 0 0
Expenses (1,164) (652) (788)
Treasury [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Interest income 10,795 36,278 40,289
Interest expense (7,104) (14,979) (14,779)
Net interest income 3,691 21,299 25,510
Provision for loan and lease losses, net (435) (288) (223)
Non-interest income 4,499 8,327 46
Non-interest expenses (4,049) (4,326) (4,181)
Income (loss) before income taxes 2,427 23,457 19,814
Income tax expense (benefit) 54 1,986 4,326
Net income 2,373 21,471 15,488
Total assets 2,436,029 2,865,186 1,708,455
Treasury [Member] | Operating Segments [Member] | Intersegment [Member]      
Segment Reporting Information [Line Items]      
Revenues 0 0 0
Expenses $ (1,279) $ (1,555) $ (1,338)