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Loans and Leases - Outstanding Principal Balance and Related Carrying Amounts (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	$ 3,689	$ 3,652
Carrying amount	3,504	3,438
VIST Financial Corp. (VIST Financial) | Acquired Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	12,100	12,822
Carrying amount	10,464	11,036
VIST Financial Corp. (VIST Financial) | Acquired Non-Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	238,802	256,265
Carrying amount	236,855	254,162
VIST Financial Corp. (VIST Financial) | Total Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance	250,902	269,087
Carrying amount	$ 247,319	$ 265,198

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
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