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Loans - Aging Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Aged analysis of past due loans
Total Past Due		$ 5,606
Current	$ 1,867,663	1,597,628
Nonaccrual	16,006	14,388
Total Loans	1,897,027	1,617,622	$ 1,478,809
Total Loans	1,897,027	1,617,622
Total Loans	13,358
Recorded Investment 90 days or Greater Past Due and Accruing	935	254
30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due		4,212
Total Loans	10,617
60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due		1,146
Total Loans	1,824
90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due		248
Total Loans	917
PCI
Aged analysis of past due loans
Current	7,248
Nonaccrual	2,265
Total Loans	10,965
Recorded Investment 90 days or Greater Past Due and Accruing	935
Non-PCI
Aged analysis of past due loans
Current	1,860,415
Nonaccrual	13,741
Total Loans	1,886,062
Multifamily
Aged analysis of past due loans
Total Past Due	724
Current	195,504	125,049,000
Nonaccrual		4,723,000
Total Loans	196,228	129,772,000
Recorded Investment 90 days or Greater Past Due and Accruing	180
Multifamily | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	545
Multifamily | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	179
Construction Loans
Aged analysis of past due loans
Total Loans		85,162	64,720
Total Loans	109,135
Commercial
Aged analysis of past due loans
Total Past Due	410	1,270
Current	313,913	271,581
Total Loans	314,323	272,851	228,113
Recorded Investment 90 days or Greater Past Due and Accruing	361
Commercial | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	58	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	352
Lease financing receivables
Aged analysis of past due loans
Current	78,806	68,147
Nonaccrual		178
Total Loans	78,806	68,325	55,451
Real estate - commercial
Aged analysis of past due loans
Total Loans		750,991	736,247
Total Loans	825,123
Real estate - commercial | Owner occupied general purpose
Aged analysis of past due loans
Total Past Due	1,801	1,136
Current	160,892	144,267
Nonaccrual	1,579	455
Total Loans	164,272	145,858
Recorded Investment 90 days or Greater Past Due and Accruing	36
Real estate - commercial | Owner occupied general purpose | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,768	1,136
Real estate - commercial | Owner occupied general purpose | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	33
Real estate - commercial | Owner occupied special purpose
Aged analysis of past due loans
Total Past Due	961	226
Current	192,426	170,546
Nonaccrual	395	342
Total Loans	193,782	171,114
Real estate - commercial | Owner occupied special purpose | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	826	226
Real estate - commercial | Owner occupied special purpose | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	135
Real estate - commercial | Non-owner occupied general purpose
Aged analysis of past due loans
Total Past Due	3,035	593
Current	286,115	273,203
Nonaccrual	4,236	1,163
Total Loans	293,386	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	2,832
Real estate - commercial | Non-owner occupied general purpose | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	203	593
Real estate - commercial | Non-owner occupied special purpose
Aged analysis of past due loans
Total Past Due		248
Current	106,036	92,923
Nonaccrual	3,099
Total Loans	109,135	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	620
Current	45,968	49,538
Nonaccrual		1,081
Total Loans	46,588	50,619
Real estate - commercial | Retail properties | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	620
Real estate - commercial | Farm
Aged analysis of past due loans
Current	13,778	15,270
Total Loans	13,778	15,270
Real estate - commercial | Construction Loans | Homebuilder
Aged analysis of past due loans
Total Past Due		129
Current	5,102	2,221
Total Loans	5,102	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	266	1,124
Current	2,478	1,319
Total Loans	2,744	2,443
Real estate - commercial | Construction Loans | Land | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	266	1,124
Real estate - commercial | Construction Loans | Commercial speculative
Aged analysis of past due loans
Total Past Due	350
Current	55,060	32,028
Total Loans	55,410	32,028
Recorded Investment 90 days or Greater Past Due and Accruing	355
Real estate - commercial | Construction Loans | Commercial speculative | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	350
Real estate - commercial | Construction Loans | All other
Aged analysis of past due loans
Current	45,028	48,140
Nonaccrual	106	201
Total Loans	45,134	48,341
Real estate - residential
Aged analysis of past due loans
Total Loans		313,397	276,225
Total Loans	413,106
Real estate - residential | Investor
Aged analysis of past due loans
Total Past Due	957
Current	69,148	55,248
Nonaccrual	353	372
Total Loans	70,458	55,620
Real estate - residential | Investor | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	801
Real estate - residential | Investor | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	156
Real estate - residential | Multifamily
Aged analysis of past due loans
Total Loans		129,772
Real estate - residential | Owner occupied
Aged analysis of past due loans
Total Past Due	1,946	74
Current	135,360	123,257
Nonaccrual	3,076	4,674
Total Loans	140,382	128,005
Real estate - residential | Owner occupied | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,241	74
Real estate - residential | Owner occupied | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	705
Real estate - residential | Revolving and junior liens
Aged analysis of past due loans
Total Past Due	775	769
Current	138,801	110,872
Nonaccrual	866	1,192
Total Loans	140,442	112,833
Real estate - residential | Revolving and junior liens | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	775	491
Real estate - residential | Revolving and junior liens | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due		278
Consumer
Aged analysis of past due loans
Total Loans		112,833	101,626
Total Loans	140,442
All other
Aged analysis of past due loans
Total Past Due	61	37
Current	16,000	14,019
Nonaccrual	31	7
Total Loans	16,092	14,063	$ 16,427
Total Loans	16,092
Recorded Investment 90 days or Greater Past Due and Accruing	3
All other | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	53	$ 37
All other | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	5
All other | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	$ 3

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