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Loans and Allowance - Credit Quality of Loan Portfolio by Loan Class (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 $ 923,091  
2020 3,744,372  
2019 1,208,586  
2018 677,245  
2017 502,173  
Prior 906,900  
Revolving loans amortized cost basis 1,355,861  
Loans 9,318,228 $ 9,243,174
Commercial Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   7,000,298
Commercial Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   334,989
Commercial Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   234,712
Commercial Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Commercial Loss    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Consumer Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   1,666,062
Consumer Non-Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   7,113
PPP loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 293,100  
2020 448,600  
Loans 741,700 667,100
Commercial and industrial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 461,373  
2020 1,157,272  
2019 273,425  
2018 129,457  
2017 49,876  
Prior 67,813  
Revolving loans amortized cost basis 736,996  
Loans 2,876,212 2,776,699
Commercial and industrial loans | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 451,747  
2020 1,101,622  
2019 265,685  
2018 121,416  
2017 47,101  
Prior 64,093  
Revolving loans amortized cost basis 634,146  
Loans 2,685,810  
Commercial and industrial loans | Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 7,735  
2020 50,704  
2019 1,421  
2018 7,435  
2017 2,306  
Prior 2,326  
Revolving loans amortized cost basis 29,255  
Loans 101,182  
Commercial and industrial loans | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 1,891  
2020 4,946  
2019 6,319  
2018 606  
2017 469  
Prior 1,394  
Revolving loans amortized cost basis 73,595  
Loans 89,220  
Commercial and industrial loans | Commercial Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   2,562,077
Commercial and industrial loans | Commercial Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   117,503
Commercial and industrial loans | Commercial Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   97,119
Commercial and industrial loans | Commercial Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Commercial and industrial loans | Commercial Loss    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Commercial and industrial loans | Consumer Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Commercial and industrial loans | Consumer Non-Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Agricultural land, production and other loans to farmers    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 22,721  
2020 63,357  
2019 26,396  
2018 14,140  
2017 9,538  
Prior 53,870  
Revolving loans amortized cost basis 55,609  
Loans 245,631 281,884
Agricultural land, production and other loans to farmers | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 22,570  
2020 58,620  
2019 26,146  
2018 11,864  
2017 8,821  
Prior 49,646  
Revolving loans amortized cost basis 45,626  
Loans 223,293  
Agricultural land, production and other loans to farmers | Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 151  
2020 621  
2019 186  
2018 2,151  
2017 0  
Prior 3,347  
Revolving loans amortized cost basis 8,824  
Loans 15,280  
Agricultural land, production and other loans to farmers | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 0  
2020 4,116  
2019 64  
2018 125  
2017 717  
Prior 877  
Revolving loans amortized cost basis 1,159  
Loans 7,058  
Agricultural land, production and other loans to farmers | Commercial Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   243,991
Agricultural land, production and other loans to farmers | Commercial Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   26,835
Agricultural land, production and other loans to farmers | Commercial Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   9,885
Agricultural land, production and other loans to farmers | Commercial Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Agricultural land, production and other loans to farmers | Commercial Loss    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Agricultural land, production and other loans to farmers | Consumer Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   1,173
Agricultural land, production and other loans to farmers | Consumer Non-Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 65,191  
2020 218,970  
2019 165,903  
2018 68,879  
2017 3,104  
Prior 1,963  
Revolving loans amortized cost basis 17,214  
Loans 541,224 484,723
Construction | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 60,800  
2020 208,852  
2019 165,903  
2018 68,816  
2017 3,104  
Prior 1,945  
Revolving loans amortized cost basis 17,184  
Loans 526,604  
Construction | Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 0  
2020 10,118  
2019 0  
2018 63  
2017 0  
Prior 0  
Revolving loans amortized cost basis 30  
Loans 10,211  
Construction | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 4,391  
2020 0  
2019 0  
2018 0  
2017 0  
Prior 18  
Revolving loans amortized cost basis 0  
Loans 4,409  
Construction | Commercial Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   446,846
Construction | Commercial Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   10,445
Construction | Commercial Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   5,549
Construction | Commercial Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Construction | Commercial Loss    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Construction | Consumer Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   21,763
Construction | Consumer Non-Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   120
Commercial real estate, non-owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 103,508  
2020 1,141,062  
2019 313,326  
2018 238,546  
2017 149,787  
Prior 205,899  
Revolving loans amortized cost basis 26,704  
Loans 2,178,832 2,220,949
Commercial real estate, non-owner occupied | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 93,726  
2020 933,226  
2019 275,343  
2018 225,971  
2017 141,947  
Prior 196,284  
Revolving loans amortized cost basis 25,454  
Loans 1,891,951  
Commercial real estate, non-owner occupied | Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 9,544  
2020 169,291  
2019 13,242  
2018 990  
2017 0  
Prior 112  
Revolving loans amortized cost basis 1,250  
Loans 194,429  
Commercial real estate, non-owner occupied | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 238  
2020 38,545  
2019 24,741  
2018 11,585  
2017 7,840  
Prior 9,503  
Revolving loans amortized cost basis 0  
Loans 92,452  
Commercial real estate, non-owner occupied | Commercial Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   1,979,827
Commercial real estate, non-owner occupied | Commercial Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   160,304
Commercial real estate, non-owner occupied | Commercial Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   80,818
Commercial real estate, non-owner occupied | Commercial Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Commercial real estate, non-owner occupied | Commercial Loss    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Commercial real estate, non-owner occupied | Consumer Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Commercial real estate, non-owner occupied | Consumer Non-Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Commercial real estate, owner occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 56,880  
2020 510,636  
2019 124,777  
2018 61,356  
2017 63,552  
Prior 92,959  
Revolving loans amortized cost basis 39,878  
Loans 950,038 958,501
Commercial real estate, owner occupied | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 51,710  
2020 481,355  
2019 122,017  
2018 57,531  
2017 60,587  
Prior 89,802  
Revolving loans amortized cost basis 39,729  
Loans 902,731  
Commercial real estate, owner occupied | Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 45  
2020 10,174  
2019 2,606  
2018 1,646  
2017 2,242  
Prior 1,178  
Revolving loans amortized cost basis 149  
Loans 18,040  
Commercial real estate, owner occupied | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 5,079  
2020 19,107  
2019 154  
2018 2,179  
2017 723  
Prior 1,979  
Revolving loans amortized cost basis 0  
Loans 29,221  
Commercial real estate, owner occupied | Commercial Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   907,566
Commercial real estate, owner occupied | Commercial Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   17,641
Commercial real estate, owner occupied | Commercial Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   33,294
Commercial real estate, owner occupied | Commercial Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans  
Commercial real estate, owner occupied | Commercial Loss    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 46  
2020 0  
2019 0  
2018 0  
2017 0  
Prior 0  
Revolving loans amortized cost basis 0  
Loans 46
Commercial real estate, owner occupied | Consumer Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Commercial real estate, owner occupied | Consumer Non-Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Residential Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 171,943  
2020 402,246  
2019 148,975  
2018 103,570  
2017 89,154  
Prior 320,071  
Revolving loans amortized cost basis 3,966  
Loans 1,239,925 1,234,741
Residential Real Estate | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 171,109  
2020 398,112  
2019 148,457  
2018 101,627  
2017 88,700  
Prior 314,130  
Revolving loans amortized cost basis 3,873  
Loans 1,226,008  
Residential Real Estate | Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 349  
2020 982  
2019 0  
2018 588  
2017 82  
Prior 1,313  
Revolving loans amortized cost basis 93  
Loans 3,407  
Residential Real Estate | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 485  
2020 3,152  
2019 518  
2018 1,355  
2017 372  
Prior 4,628  
Revolving loans amortized cost basis 0  
Loans 10,510  
Residential Real Estate | Commercial Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   199,338
Residential Real Estate | Commercial Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   2,261
Residential Real Estate | Commercial Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   7,058
Residential Real Estate | Commercial Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Residential Real Estate | Commercial Loss    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Residential Real Estate | Consumer Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   1,020,687
Residential Real Estate | Consumer Non-Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   5,397
Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 3,076  
2020 20,274  
2019 2,577  
2018 2,943  
2017 1,915  
Prior 5,339  
Revolving loans amortized cost basis 446,105  
Loans 482,229 508,259
Home equity | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 2,673  
2020 20,032  
2019 2,577  
2018 2,930  
2017 1,786  
Prior 5,085  
Revolving loans amortized cost basis 442,166  
Loans 477,249  
Home equity | Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 0  
2020 91  
2019 0  
2018 0  
2017 0  
Prior 59  
Revolving loans amortized cost basis 2,588  
Loans 2,738  
Home equity | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 403  
2020 151  
2019 0  
2018 13  
2017 129  
Prior 195  
Revolving loans amortized cost basis 1,351  
Loans 2,242  
Home equity | Commercial Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   12,714
Home equity | Commercial Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Home equity | Commercial Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   989
Home equity | Commercial Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Home equity | Commercial Loss    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Home equity | Consumer Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   492,999
Home equity | Consumer Non-Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   1,557
Individuals' loans for household and other personal expenditures    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 16,786  
2020 38,747  
2019 24,363  
2018 18,517  
2017 4,391  
Prior 7,583  
Revolving loans amortized cost basis 16,000  
Loans 126,387 129,479
Individuals' loans for household and other personal expenditures | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 16,786  
2020 38,678  
2019 24,201  
2018 18,482  
2017 4,383  
Prior 7,550  
Revolving loans amortized cost basis 15,996  
Loans 126,076  
Individuals' loans for household and other personal expenditures | Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 0  
2020 68  
2019 75  
2018 35  
2017 8  
Prior 33  
Revolving loans amortized cost basis 4  
Loans 223  
Individuals' loans for household and other personal expenditures | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 0  
2020 1  
2019 87  
2018 0  
2017 0  
Prior 0  
Revolving loans amortized cost basis 0  
Loans 88  
Individuals' loans for household and other personal expenditures | Commercial Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Individuals' loans for household and other personal expenditures | Commercial Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Individuals' loans for household and other personal expenditures | Commercial Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Individuals' loans for household and other personal expenditures | Commercial Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Individuals' loans for household and other personal expenditures | Commercial Loss    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Individuals' loans for household and other personal expenditures | Consumer Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   129,440
Individuals' loans for household and other personal expenditures | Consumer Non-Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   39
Public finance and other commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 21,613  
2020 191,808  
2019 128,844  
2018 39,837  
2017 130,856  
Prior 151,403  
Revolving loans amortized cost basis 13,389  
Loans 677,750 647,939
Public finance and other commercial loans | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2021 21,613  
2020 191,808  
2019 128,844  
2018 39,837  
2017 130,856  
Prior 151,403  
Revolving loans amortized cost basis 13,389  
Loans $ 677,750  
Public finance and other commercial loans | Commercial Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   647,939
Public finance and other commercial loans | Commercial Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Public finance and other commercial loans | Commercial Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Public finance and other commercial loans | Commercial Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Public finance and other commercial loans | Commercial Loss    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Public finance and other commercial loans | Consumer Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   0
Public finance and other commercial loans | Consumer Non-Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans   $ 0