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Loans and Allowance for Loan Losses - Aging of Past Due Loans by Class of Loan (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Past Due [Line Items]    
Total Past Due $ 25,169,000 $ 19,203,000
Current 3,575,833,000 3,549,001,000 [1]
Total ending loan balance 3,601,002,000 3,568,204,000
30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 20,538,000 13,396,000
60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 1,813,000 2,548,000
Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 2,818,000 3,259,000
Construction Real Estate Loans    
Financing Receivable, Past Due [Line Items]    
Total Past Due 1,800,000 1,802,000
Current 602,152,000 643,146,000 [1]
Total ending loan balance 603,952,000 644,948,000
Construction Real Estate Loans | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 985,000 1,236,000
Construction Real Estate Loans | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 205,000 229,000
Construction Real Estate Loans | Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 610,000 337,000
1-4 Family Residential Real Estate Loans    
Financing Receivable, Past Due [Line Items]    
Total Past Due 15,058,000 11,472,000
Current 772,817,000 776,090,000 [1]
Total ending loan balance 787,875,000 787,562,000
1-4 Family Residential Real Estate Loans | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 12,713,000 8,788,000
1-4 Family Residential Real Estate Loans | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 411,000 1,077,000
1-4 Family Residential Real Estate Loans | Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 1,934,000 1,607,000
Commercial Real Estate Loans    
Financing Receivable, Past Due [Line Items]    
Total Past Due 2,102,000 1,590,000
Current 1,348,716,000 1,248,618,000 [1]
Total ending loan balance 1,350,818,000 1,250,208,000
Commercial Real Estate Loans | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 1,944,000 795,000
Commercial Real Estate Loans | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 158,000 259,000
Commercial Real Estate Loans | Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 0 536,000
Commercial loans    
Financing Receivable, Past Due [Line Items]    
Total Past Due 5,049,000 3,290,000
Current 378,935,000 398,231,000 [1]
Total ending loan balance 383,984,000 401,521,000
Commercial loans | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 3,935,000 1,917,000
Commercial loans | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 878,000 722,000
Commercial loans | Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 236,000 651,000
Municipal loans    
Financing Receivable, Past Due [Line Items]    
Total Past Due 0 0
Current 375,934,000 383,960,000 [1]
Total ending loan balance 375,934,000 383,960,000
Municipal loans | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 0 0
Municipal loans | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 0 0
Municipal loans | Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 0 0
Loans to individuals    
Financing Receivable, Past Due [Line Items]    
Total Past Due 1,160,000 1,049,000
Current 97,279,000 98,956,000 [1]
Total ending loan balance 98,439,000 100,005,000
Loans to individuals | 30-59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 961,000 660,000
Loans to individuals | 60-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 161,000 261,000
Loans to individuals | Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due $ 38,000 $ 128,000
[1]
Prior to the adoption of CECL, included PCI loans measured at fair value at acquisition if the timing and amount of cash flows expected to be collected from those sales could be reasonably estimated.