Non Purchased Loans - Impact of Modifications Classified as Restructured Loans (Details) - Non purchased loans and leases $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) loan	Sep. 30, 2016 USD ($) loan	Sep. 30, 2017 USD ($) loan	Sep. 30, 2016 USD ($) loan
Restructured loans
Number of Loans | loan	5	3	13	12
Pre- Modification Outstanding Recorded Investment	$ 537	$ 704	$ 1,298	$ 2,238
Post- Modification Outstanding Recorded Investment	$ 482	$ 657	$ 922	$ 2,131
Real estate – 1-4 family mortgage
Restructured loans
Number of Loans | loan	4	2	9	10
Pre- Modification Outstanding Recorded Investment	$ 307	$ 194	$ 611	$ 1,199
Post- Modification Outstanding Recorded Investment	$ 307	$ 147	$ 601	$ 1,096
Real estate – commercial mortgage
Restructured loans
Number of Loans | loan	1		3	1
Pre- Modification Outstanding Recorded Investment	$ 230		$ 683	$ 529
Post- Modification Outstanding Recorded Investment	$ 175		$ 318	$ 525
Installment loans to individuals
Restructured loans
Number of Loans | loan	0		1
Pre- Modification Outstanding Recorded Investment	$ 0		$ 4
Post- Modification Outstanding Recorded Investment	$ 0		$ 3
Real estate – construction
Restructured loans
Number of Loans | loan		1		1
Pre- Modification Outstanding Recorded Investment		$ 510		$ 510
Post- Modification Outstanding Recorded Investment		$ 510		$ 510