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Loans - Aging Analysis (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Aged analysis of past due loans
Total Past Due	$ 16,881	$ 5,606
Current	1,805,789	1,597,628
Nonaccrual	12,279	14,388
Total Loans	1,834,949	1,617,622	$ 1,594,191
Recorded Investment 90 days or Greater Past Due and Accruing	82	254
30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	13,151	4,212
60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	3,651	1,146
90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	79	248
PCI
Aged analysis of past due loans
Total Past Due	3,415
Current	5,174
Nonaccrual	2,298
Total Loans	10,887
PCI | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	3,415
Non-PCI
Aged analysis of past due loans
Total Past Due	13,466
Current	1,800,615
Nonaccrual	9,981
Total Loans	1,824,062	1,617,622
Recorded Investment 90 days or Greater Past Due and Accruing	82
Non-PCI | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	9,736
Non-PCI | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	3,651
Non-PCI | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	79
Multifamily
Aged analysis of past due loans
Total Past Due	1,377
Current	179,645	125,049
Nonaccrual		4,723
Total Loans	181,022	129,772
Recorded Investment 90 days or Greater Past Due and Accruing	76
Multifamily | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,304
Multifamily | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	73
Commercial
Aged analysis of past due loans
Total Past Due	1,080	1,270
Current	305,327	271,581
Total Loans	306,407	272,851	257,356
Recorded Investment 90 days or Greater Past Due and Accruing	6
Commercial | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,074	995
Commercial | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due		275
Commercial | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	6
Lease financing receivables
Aged analysis of past due loans
Current	70,661	68,147
Nonaccrual		178
Total Loans	70,661	68,325	69,305
Real estate - commercial
Aged analysis of past due loans
Total Loans			739,136
Real estate - commercial | Owner occupied general purpose
Aged analysis of past due loans
Total Past Due	1,022	1,136
Current	164,304	144,267
Nonaccrual	1,625	455
Total Loans	166,951	145,858
Real estate - commercial | Owner occupied general purpose | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,022	1,136
Real estate - commercial | Owner occupied special purpose
Aged analysis of past due loans
Total Past Due	891	226
Current	188,984	170,546
Nonaccrual	410	342
Total Loans	190,285	171,114
Real estate - commercial | Owner occupied special purpose | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	891	226
Real estate - commercial | Non-owner occupied general purpose
Aged analysis of past due loans
Total Past Due	3,768	593
Current	293,979	273,203
Nonaccrual	142	1,163
Total Loans	297,889	274,959
Real estate - commercial | Non-owner occupied general purpose | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	346
Real estate - commercial | Non-owner occupied general purpose | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	3,422	593
Real estate - commercial | Non-owner occupied special purpose
Aged analysis of past due loans
Total Past Due		248
Current	85,171	92,923
Nonaccrual	3,099
Total Loans	88,270	93,171
Recorded Investment 90 days or Greater Past Due and Accruing		254
Real estate - commercial | Non-owner occupied special purpose | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due		248
Real estate - commercial | Retail properties
Aged analysis of past due loans
Total Past Due	624
Current	46,252	49,538
Nonaccrual		1,081
Total Loans	46,876	50,619
Real estate - commercial | Retail properties | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	624
Real estate - commercial | Farm
Aged analysis of past due loans
Total Past Due	1,241
Current	12,672	15,270
Total Loans	13,913	15,270
Real estate - commercial | Farm | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,241
Real estate - commercial | Construction Loans
Aged analysis of past due loans
Total Loans			94,868
Real estate - commercial | Construction Loans | Homebuilder
Aged analysis of past due loans
Total Past Due		129
Current	4,556	2,221
Total Loans	4,556	2,350
Real estate - commercial | Construction Loans | Homebuilder | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due		129
Real estate - commercial | Construction Loans | Land
Aged analysis of past due loans
Total Past Due		1,124
Current	3,841	1,319
Total Loans	3,841	2,443
Real estate - commercial | Construction Loans | Land | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due		1,124
Real estate - commercial | Construction Loans | Commercial speculative
Aged analysis of past due loans
Current	56,052	32,028
Total Loans	56,052	32,028
Real estate - commercial | Construction Loans | All other
Aged analysis of past due loans
Total Past Due	38
Current	48,277	48,140
Nonaccrual	109	201
Total Loans	48,424	48,341
Real estate - commercial | Construction Loans | All other | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	38
Real estate - residential
Aged analysis of past due loans
Total Loans			303,080
Real estate - residential | Investor
Aged analysis of past due loans
Total Past Due	952
Current	70,102	55,248
Nonaccrual	364	372
Total Loans	71,418	55,620
Real estate - residential | Investor | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	952
Real estate - residential | Owner occupied
Aged analysis of past due loans
Total Past Due	916	74
Current	136,678	123,257
Nonaccrual	3,564	4,674
Total Loans	141,158	128,005
Real estate - residential | Owner occupied | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	780	74
Real estate - residential | Owner occupied | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	136
Real estate - residential | Home Equity Line of Credit
Aged analysis of past due loans
Total Past Due	1,514	769
Current	119,880	110,872
Nonaccrual	628	1,192
Total Loans	122,022	112,833
Real estate - residential | Home Equity Line of Credit | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,422	491
Real estate - residential | Home Equity Line of Credit | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	92	278
Consumer
Aged analysis of past due loans
Total Loans			116,503
All other
Aged analysis of past due loans
Total Past Due	43	37
Current	14,234	14,019
Nonaccrual	40	7
Total Loans	14,317	14,063	$ 13,943
All other | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	42	$ 37
All other | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	$ 1

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Recorded investment in financing receivables that are 90 days or more past due and still accruing.

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