Securities - (Details 3) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Amortized Cost
Due within one year	$ 19,610
Due after one year through five years	106,455
Due after five years through ten years	199,168
Due after ten years	123,143
Amortized Cost	448,376	$ 458,400
Fair Value
Due within one year	19,780
Due after one year through five years	109,612
Due after five years through ten years	206,350
Due after ten years	130,318
Fair Value	466,060	473,753
Amortized Cost
Due within one year	0
Due after one year through five years	6,087
Due after five years through ten years	0
Due after ten years	24,732
Available for sale debt securities	649,237	647,658
Amortized cost	649,237
Fair Value
Due within one year	0
Due after one year through five years	6,217
Due after five years through ten years	0
Due after ten years	18,947
Securities available for sale	653,444	646,805
Other debt securities
Amortized Cost
Available for sale debt securities	17,873	18,899
Fair Value
Securities available for sale	18,426	19,333
Other equity securities
Amortized Cost
Available for sale debt securities	2,426	2,500
Other equity securities	2,426
Fair Value
Securities available for sale	3,691	4,340
Government agency mortgage backed securities | Residential mortgage backed securities:
Amortized Cost
Available for sale debt securities	357,942	362,669
Fair Value
Securities available for sale	363,072	364,540
Government agency mortgage backed securities | Commercial mortgage backed securities:
Amortized Cost
Available for sale debt securities	55,574	58,864
Fair Value
Securities available for sale	57,135	59,759
Government agency collateralized mortgage obligations | Residential mortgage backed securities:
Amortized Cost
Available for sale debt securities	179,764	168,916
Fair Value
Securities available for sale	180,908	168,060
Government agency collateralized mortgage obligations | Commercial mortgage backed securities:
Amortized Cost
Available for sale debt securities	4,839	4,947
Fair Value
Securities available for sale	$ 5,048	$ 5,104