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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses - Allowance (Details) $ in Thousands	12 Months Ended
	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.

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Minimum balance of adversely classified loan in which a detailed analysis is performed.

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