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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses, Part III (PCI Loans) (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Carrying Amount [Abstract]
Allowance for loan losses			$ 0
Carrying amount, net of allowance	$ 2,518,467,000	$ 2,616,822,000
Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	8,990,000	15,623,000	16,026,000
Allowance for loan losses	(790,000)	(1,235,000)	0
Carrying amount, net of allowance	8,200,000	14,388,000
Financing Receivable, Allowance for Credit Losses Reversed	697,000	65,000
Agricultural loans | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	0	4,000
Construction and land development | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	270,000	2,558,000
Agricultural real estate | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	0	0
1-4 Family residential properties | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	1,804,000	2,206,000
Multifamily residential properties | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	2,294,000	3,891,000
Commercial real estate | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	4,622,000	6,946,000
Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	8,990,000	15,601,000
Commercial and industrial loans | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	0	15,000
Consumer loans
Carrying Amount [Abstract]
Carrying amount	92,492,000	100,041,000
Consumer loans | Financial Asset Acquired with Credit Deterioration [Member]
Carrying Amount [Abstract]
Carrying amount	0	3,000	6,000
Allowance for loan losses	$ 0	$ 0	$ 0

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
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Amount after allowance and 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 and loans held for sale.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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