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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses - Allowance (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) alternative | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Financing Receivable, Impaired [Line Items] |  |  |
Minimum balance of adversely classified loan in which a detailed analysis is performed | $ 250 |  |
Number of alternatives for measuring impaired loans receivable | alternative | 3 |  |
Balance, beginning of year | $ 26,189 | $ 19,977 | $ 16,753
Provision for loan losses | 6,433 | 8,667 | 7,462
Losses charged off | (6,326) | (2,993) | (5,195)
Recoveries | 615 | 538 | 957
Balance, end of period | 26,911 | 26,189 | 19,977
Individually evaluated for impairment | 733 | 2,044 | 614
Collectively evaluated for impairment | 25,813 | 22,910 | 19,354
Ending balance | 2,695,347 | 2,644,519 | 1,939,501
Individually evaluated for impairment | 18,489 | 16,980 | 13,086
Collectively evaluated for impairment | $ 2,671,907 | 2,611,916 | 1,926,156
Unsecured Open-end Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Period When Loans Are Charged Down | 180 days |  |
Other Secured Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Period When Loans Are Charged Down | 120 days |  |
Commercial/Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Balance, beginning of year | $ 21,556 | 16,546 | 12,901
Provision for loan losses | 4,212 | 6,070 | 6,884
Losses charged off | (4,322) | (1,227) | (3,795)
Recoveries | 172 | 167 | 556
Balance, end of period | 21,618 | 21,556 | 16,546
Individually evaluated for impairment | 548 | 1,816 | 586
Collectively evaluated for impairment | 20,711 | 18,514 | 15,951
Ending balance | 1,882,755 | 1,784,741 | 1,371,787
Individually evaluated for impairment | 13,487 | 14,422 | 11,372
Collectively evaluated for impairment | 1,864,688 | 1,756,908 | 1,360,156
Agriculture/Agricultural Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Balance, beginning of year | 2,197 | 1,742 | 2,249
Provision for loan losses | 318 | 548 | 153
Losses charged off | (45) | (93) | (662)
Recoveries | 9 | 0 | 2
Balance, end of period | 2,479 | 2,197 | 1,742
Individually evaluated for impairment | 8 | 0 | 2
Collectively evaluated for impairment | 2,471 | 2,197 | 1,740
Ending balance | 376,639 | 367,211 | 213,521
Individually evaluated for impairment | 85 | 32 | 488
Collectively evaluated for impairment | 376,554 | 367,175 | 213,033
Residential Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Balance, beginning of year | 1,504 | 886 | 874
Provision for loan losses | 502 | 1,447 | 100
Losses charged off | (695) | (886) | (217)
Recoveries | 75 | 57 | 129
Balance, end of period | 1,386 | 1,504 | 886
Individually evaluated for impairment | 176 | 225 | 25
Collectively evaluated for impairment | 1,204 | 1,270 | 861
Ending balance | 345,139 | 392,526 | 315,123
Individually evaluated for impairment | 4,783 | 2,360 | 1,026
Collectively evaluated for impairment | $ 339,985 | 387,961 | 314,097
1-4 Family residential properties |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Period When Loans Are Charged Down | 180 days |  |
Consumer loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Balance, beginning of year | $ 932 | 803 | 693
Provision for loan losses | 1,401 | 602 | 361
Losses charged off | (1,264) | (787) | (521)
Recoveries | 359 | 314 | 270
Balance, end of period | 1,428 | 932 | 803
Individually evaluated for impairment | 1 | 3 | 1
Collectively evaluated for impairment | 1,427 | 929 | 802
Ending balance | 90,814 | 100,041 | 39,070
Individually evaluated for impairment | 134 | 166 | 200
Collectively evaluated for impairment | 90,680 | 99,872 | 38,870
Unallocated [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Balance, beginning of year | 0 | 0 | 36
Provision for loan losses | 0 | 0 | (36)
Losses charged off | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Balance, end of period | 0 | 0 | 0
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 0 | 0 | 0
Ending balance | 0 | 0 | 0
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 0 | 0 | 0
Financial Asset Acquired with Credit Deterioration [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses | 365 | 1,235 | 9
Financing Receivable, Net | 4,951 | 15,623 | 259
Financial Asset Acquired with Credit Deterioration [Member] | Commercial/Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses | 359 | 1,226 | 9
Financing Receivable, Net | 4,580 | 13,411 | 259
Financial Asset Acquired with Credit Deterioration [Member] | Agriculture/Agricultural Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses | 0 | 0 | 0
Financing Receivable, Net | 0 | 4 | 0
Financial Asset Acquired with Credit Deterioration [Member] | Residential Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses | 6 | 9 | 0
Financing Receivable, Net | 371 | 2,205 | 0
Financial Asset Acquired with Credit Deterioration [Member] | Consumer loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses | 0 | 0 | 0
Financing Receivable, Net | 0 | 3 | 0
Financial Asset Acquired with Credit Deterioration [Member] | Unallocated [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses | 0 | 0 | 0
Financing Receivable, Net | $ 0 | $ 0 | $ 0

X
- Definition Amount net of deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References No definition available. + Details
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