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Loans (Allowance for Credit Losses for Loans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 16,278	$ 15,823
Provision for credit loss expense	5,150	675
Initial allowance on loans purchased with credit deterioration	0
Loans charged-off	(569)	(401)
Recoveries collected	129	146
Ending Balance	36,641	16,243
Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	405
Impact of ASC 326 Adoption | Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	8,767
Impact of ASC 326 Adoption | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	6,886
Commercial and Industrial Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	4,799
Provision for credit loss expense	(137)
Initial allowance on loans purchased with credit deterioration	0
Loans charged-off	(296)
Recoveries collected	12
Ending Balance	8,814
Commercial and Industrial Loans | Impact of ASC 326 Adoption | Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,245
Commercial and Industrial Loans | Impact of ASC 326 Adoption | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,191
Commercial and Industrial Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	4,799	2,953
Provision for credit loss expense		347
Loans charged-off		0
Recoveries collected		17
Ending Balance		3,317
Commercial and Industrial Loans and Leases | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0
Commercial Real Estate Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	4,692	5,291
Provision for credit loss expense	5,167	565
Initial allowance on loans purchased with credit deterioration	0
Loans charged-off	0	(120)
Recoveries collected	3	5
Ending Balance	17,310	5,741
Commercial Real Estate Loans | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	400
Commercial Real Estate Loans | Impact of ASC 326 Adoption | Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	3,063
Commercial Real Estate Loans | Impact of ASC 326 Adoption | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	4,385
Agricultural Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	5,315	5,776
Provision for credit loss expense	(396)	(323)
Initial allowance on loans purchased with credit deterioration	0
Loans charged-off	0	0
Recoveries collected	0	0
Ending Balance	6,485	5,453
Agricultural Loans | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0
Agricultural Loans | Impact of ASC 326 Adoption | Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	1,438
Agricultural Loans | Impact of ASC 326 Adoption | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	128
Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0
Provision for credit loss expense	67
Initial allowance on loans purchased with credit deterioration	0
Loans charged-off	0
Recoveries collected	0
Ending Balance	172
Leases | Impact of ASC 326 Adoption | Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	105
Leases | Impact of ASC 326 Adoption | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0
Consumer Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	434	420
Provision for credit loss expense	205	209
Initial allowance on loans purchased with credit deterioration	0
Loans charged-off	(237)	(267)
Recoveries collected	112	121
Ending Balance	455	483
Consumer Loans | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0
Consumer Loans | Impact of ASC 326 Adoption | Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	(59)
Consumer Loans | Impact of ASC 326 Adoption | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0
Home Equity Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	200	229
Provision for credit loss expense	(20)	(15)
Initial allowance on loans purchased with credit deterioration	0
Loans charged-off	0	0
Recoveries collected	0	0
Ending Balance	977	214
Home Equity Loans | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0
Home Equity Loans | Impact of ASC 326 Adoption | Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	762
Home Equity Loans | Impact of ASC 326 Adoption | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	35
Credit Cards
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0
Provision for credit loss expense	35
Initial allowance on loans purchased with credit deterioration	0
Loans charged-off	(36)
Recoveries collected	1
Ending Balance	124
Credit Cards | Impact of ASC 326 Adoption | Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	124
Credit Cards | Impact of ASC 326 Adoption | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0
Residential Mortgage Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	333	472
Provision for credit loss expense	229	(32)
Initial allowance on loans purchased with credit deterioration	0
Loans charged-off	0	(14)
Recoveries collected	1	3
Ending Balance	2,304	429
Residential Mortgage Loans | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	5
Residential Mortgage Loans | Impact of ASC 326 Adoption | Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	1,594
Residential Mortgage Loans | Impact of ASC 326 Adoption | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	147
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	505	682
Provision for credit loss expense	0	(76)
Initial allowance on loans purchased with credit deterioration	0
Loans charged-off	0	0
Recoveries collected	0	0
Ending Balance	0	$ 606
Unallocated | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0
Unallocated | Impact of ASC 326 Adoption | Impact of adopting ASC 326
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	(505)
Unallocated | Impact of ASC 326 Adoption | Impact of adopting ASC 326 - PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 0

X

- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

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Amount of increase in allowance for credit loss on financing receivable purchased with credit deterioration.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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