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Loans (Risk Category of Loans by Class) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]      
Total $ (3,018,416)   $ (3,081,973)
Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (2,336,007)
Pass | Acquired with Deteriorated Credit Quality      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (68)
Pass | Loans Acquired In Current Year | Acquired with Deteriorated Credit Quality      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (254,629)
Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (99,228)
Special Mention | Acquired with Deteriorated Credit Quality      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (613)
Special Mention | Loans Acquired In Current Year | Acquired with Deteriorated Credit Quality      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (16,535)
Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (46,903)
Substandard | Acquired with Deteriorated Credit Quality      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (11,060)
Substandard | Loans Acquired In Current Year | Acquired with Deteriorated Credit Quality      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (12,769)
Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     0
Doubtful | Acquired with Deteriorated Credit Quality      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     0
Doubtful | Loans Acquired In Current Year | Acquired with Deteriorated Credit Quality      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     0
Total      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (2,482,138)
Total | Acquired with Deteriorated Credit Quality      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (11,741)
Total | Loans Acquired In Current Year | Acquired with Deteriorated Credit Quality      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (283,933)
Commercial and Industrial Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 (17,270)    
2019 (113,034)    
2018 (62,531)    
2017 (49,035)    
2016 (30,589)    
Prior (71,603)    
Revolving Loans Amortized Cost Basis (165,885)    
Total (509,947) $ (534,692) (589,758)
Commercial and Industrial Loans | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 (15,235)    
2019 (112,334)    
2018 (59,396)    
2017 (45,247)    
2016 (29,225)    
Prior (63,965)    
Revolving Loans Amortized Cost Basis (154,027)    
Total (479,429)    
Commercial and Industrial Loans | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 (35)    
2019 (700)    
2018 (1,703)    
2017 (3,672)    
2016 (185)    
Prior (2,289)    
Revolving Loans Amortized Cost Basis (3,142)    
Total (11,726)    
Commercial and Industrial Loans | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 (2,000)    
2018 (1,432)    
2017 (116)    
2016 (1,179)    
Prior (5,349)    
Revolving Loans Amortized Cost Basis (8,716)    
Total (18,792)    
Commercial and Industrial Loans and Leases | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (556,706)
Commercial and Industrial Loans and Leases | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (19,671)
Commercial and Industrial Loans and Leases | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (15,026)
Commercial and Industrial Loans and Leases | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     0
Commercial and Industrial Loans and Leases | Total      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (591,403)
Commercial Real Estate Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 (90,100)    
2019 (244,914)    
2018 (232,853)    
2017 (247,641)    
2016 (229,365)    
Prior (408,351)    
Revolving Loans Amortized Cost Basis (36,129)    
Total (1,489,353) (1,500,247) (1,495,862)
Commercial Real Estate Loans | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 (89,889)    
2019 (241,662)    
2018 (226,151)    
2017 (240,513)    
2016 (225,879)    
Prior (381,780)    
Revolving Loans Amortized Cost Basis (34,775)    
Total (1,440,649)   (1,453,310)
Commercial Real Estate Loans | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 (211)    
2019 (2,848)    
2018 (4,240)    
2017 (4,902)    
2016 (2,116)    
Prior (17,266)    
Revolving Loans Amortized Cost Basis (1,354)    
Total (32,937)   (30,504)
Commercial Real Estate Loans | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2019 (404)    
2018 (2,462)    
2017 (2,226)    
2016 (1,370)    
Prior (9,305)    
Total (15,767)   (16,050)
Commercial Real Estate Loans | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     0
Commercial Real Estate Loans | Total      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     (1,499,864)
Agricultural Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 (12,808)    
2019 (40,174)    
2018 (40,347)    
2017 (48,944)    
2016 (33,202)    
Prior (105,610)    
Revolving Loans Amortized Cost Basis (85,201)    
Total (366,286) (384,654) (384,526)
Agricultural Loans | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 (12,719)    
2019 (33,293)    
2018 (37,849)    
2017 (40,857)    
2016 (26,743)    
Prior (79,061)    
Revolving Loans Amortized Cost Basis (72,422)    
Total (302,944)   (325,991)
Agricultural Loans | Special Mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 (89)    
2019 (6,640)    
2018 (2,105)    
2017 (6,742)    
2016 (1,743)    
Prior (19,827)    
Revolving Loans Amortized Cost Basis (12,779)    
Total (49,925)   (49,053)
Agricultural Loans | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
2019 (241)    
2018 (393)    
2017 (1,345)    
2016 (4,716)    
Prior (6,722)    
Total (13,417)   (15,827)
Agricultural Loans | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     0
Agricultural Loans | Total      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total     $ (390,871)
Leases      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 (4,116)    
2019 (22,351)    
2018 (11,993)    
2017 (8,044)    
2016 (3,706)    
Prior (5,623)    
Total (55,833) $ (57,257)  
Leases | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
2020 (4,116)    
2019 (22,351)    
2018 (11,993)    
2017 (8,044)    
2016 (3,706)    
Prior (5,623)    
Total $ (55,833)